25315664 has 40 divisors (see below), whose sum is σ = 54184032. Its totient is φ = 11361920.

The previous prime is 25315651. The next prime is 25315687. The reversal of 25315664 is 46651352.

It is a self number, because there is not a number n which added to its sum of digits gives 25315664.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13742 + ... + 15474.

Almost surely, 2^25315664 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 25315664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27092016).

25315664 is an abundant number, since it is smaller than the sum of its proper divisors (28868368).

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

25315664 is a wasteful number, since it uses less digits than its factorization.

25315664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1835 (or 1829 counting only the distinct ones).

The product of its digits is 21600, while the sum is 32.

The square root of 25315664 is about 5031.4673803971. The cubic root of 25315664 is about 293.6273062977.

The spelling of 25315664 in words is "twenty-five million, three hundred fifteen thousand, six hundred sixty-four".