25640164 has 12 divisors (see below), whose sum is σ = 48949488. Its totient is φ = 11654600.

The previous prime is 25640081. The next prime is 25640171. The reversal of 25640164 is 46104652.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 291322 + ... + 291409.

It is an arithmetic number, because the mean of its divisors is an integer number (4079124).

Almost surely, 2^25640164 is an apocalyptic number.

It is an amenable number.

25640164 is a deficient number, since it is larger than the sum of its proper divisors (23309324).

25640164 is a wasteful number, since it uses less digits than its factorization.

25640164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 582746 (or 582744 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 28.

The square root of 25640164 is about 5063.6117544693. The cubic root of 25640164 is about 294.8765700237.

The spelling of 25640164 in words is "twenty-five million, six hundred forty thousand, one hundred sixty-four".