25715664 has 160 divisors (see below), whose sum is σ = 84022400. Its totient is φ = 7464960.

The previous prime is 25715639. The next prime is 25715671. The reversal of 25715664 is 46651752.

It is a happy number.

25715664 is a `hidden beast` number, since 25 + 71 + 566 + 4 = 666.

It is a super-2 number, since 2×25715664² = 1322590749921792, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 106584 + ... + 106824.

It is an arithmetic number, because the mean of its divisors is an integer number (525140).

Almost surely, 2^25715664 is an apocalyptic number.

25715664 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25715664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42011200).

25715664 is an abundant number, since it is smaller than the sum of its proper divisors (58306736).

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

25715664 is a wasteful number, since it uses less digits than its factorization.

25715664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 290 (or 278 counting only the distinct ones).

The product of its digits is 50400, while the sum is 36.

The square root of 25715664 is about 5071.0614273542. The cubic root of 25715664 is about 295.1657174809.

The spelling of 25715664 in words is "twenty-five million, seven hundred fifteen thousand, six hundred sixty-four".