Numbers Aplenty

Today I just stumbled upon a new site that lists information about natural numbers. It's called Numbers Aplenty.

The categories under which numbers are classified looks like this:

So for instance, today I am 25284 days old and entering that number into the search box yields:

• 25284 has 36 divisors (see below), whose sum is σ = 70224. Its totient is φ = 7056. 

• The previous prime is 25261. The next prime is 25301. The reversal of 25284 is 48252 

• Adding to 25284 its reverse (48252), we get a triangular number (73536 = T383). 

• It is a Harshad number since it is a multiple of its sum of digits (21). 

• 25284 is a Rhonda number in base 10. 

• Its product of digits (640) is a multiple of the sum of its prime factors (64). 

• It is a nialpdrome in base 14. 

• It is a self number, because there is not a number n which added to its sum of digits gives 25284. 

• It is an unprimeable number. 

• It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 567 + ... + 609. 

• 225284 is an apocalyptic number. 

• It is an amenable number. 

• It is a practical number, because each smaller number is the sum of distinct divisors of 25284, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35112). 

• 25284 is an abundant number, since it is smaller than the sum of its proper divisors (44940). 

• It is a pseudoperfect number, because it is the sum of a subset of its proper divisors. 

• 25284 is a wasteful number, since it uses less digits than its factorization. 

• 25284 is an evil number, because the sum of its binary digits is even. 

• The sum of its prime factors is 64 (or 55 counting only the distinct ones). 

• The product of its digits is 640, while the sum is 21. 

• The square root of 25284 is about 159.0094336824. The cubic root of 25284 is about 29.3504835430. 

• The spelling of 25284 in words is "twenty-five thousand, two hundred eighty-four".

Many of the terms mentioned above I'd never heard before. The site will be a useful adjunct to the Online Encyclopedia of Integer Sequences or OEIS.