25640868 has 36 divisors (see below), whose sum is σ = 65765840. Its totient is φ = 7769520.

The previous prime is 25640863. The next prime is 25640893. The reversal of 25640868 is 86804652.

It is a super-2 number, since 2×25640868² = 1314908223586848, which contains 22 as substring.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (25640863) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7378 + ... + 10281.

Almost surely, 2^25640868 is an apocalyptic number.

It is an amenable number.

25640868 is an abundant number, since it is smaller than the sum of its proper divisors (40124972).

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

25640868 is a wasteful number, since it uses less digits than its factorization.

25640868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17688 (or 17675 counting only the distinct ones).

The product of its (nonzero) digits is 92160, while the sum is 39.

The square root of 25640868 is about 5063.6812695903. The cubic root of 25640868 is about 294.8792688001.

The spelling of 25640868 in words is "twenty-five million, six hundred forty thousand, eight hundred sixty-eight".