25760664 has 24 divisors (see below), whose sum is σ = 69768660. Its totient is φ = 8586864.

The previous prime is 25760591. The next prime is 25760687. The reversal of 25760664 is 46606752.

It is a tau number, because it is divible by the number of its divisors (24).

It is a super-2 number, since 2×25760664² = 1327223619441792, 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 5 ways as a sum of consecutive naturals, for example, 178822 + ... + 178965.

Almost surely, 2^25760664 is an apocalyptic number.

25760664 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

25760664 is an abundant number, since it is smaller than the sum of its proper divisors (44007996).

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

25760664 is a wasteful number, since it uses less digits than its factorization.

25760664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 357799 (or 357792 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 36.

The square root of 25760664 is about 5075.4964289220. The cubic root of 25760664 is about 295.3377879244.

The spelling of 25760664 in words is "twenty-five million, seven hundred sixty thousand, six hundred sixty-four".