25815664 has 40 divisors (see below), whose sum is σ = 58255200. Its totient is φ = 10852608.

The previous prime is 25815659. The next prime is 25815689. The reversal of 25815664 is 46651852.

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

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, 3762 + ... + 8110.

It is an arithmetic number, because the mean of its divisors is an integer number (1456380).

Almost surely, 2^25815664 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 25815664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29127600).

25815664 is an abundant number, since it is smaller than the sum of its proper divisors (32439536).

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

25815664 is a wasteful number, since it uses less digits than its factorization.

25815664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4417 (or 4411 counting only the distinct ones).

The product of its digits is 57600, while the sum is 37.

The square root of 25815664 is about 5080.9117292077. The cubic root of 25815664 is about 295.5478243299.

The spelling of 25815664 in words is "twenty-five million, eight hundred fifteen thousand, six hundred sixty-four".