25640516 has 24 divisors (see below), whose sum is σ = 49291200. Its totient is φ = 11573600.

The previous prime is 25640501. The next prime is 25640543. The reversal of 25640516 is 61504652.

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, 4601 + ... + 8511.

It is an arithmetic number, because the mean of its divisors is an integer number (2053800).

Almost surely, 2^25640516 is an apocalyptic number.

It is an amenable number.

25640516 is a deficient number, since it is larger than the sum of its proper divisors (23650684).

25640516 is a wasteful number, since it uses less digits than its factorization.

25640516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4075 (or 4073 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 29.

The square root of 25640516 is about 5063.6465121491. The cubic root of 25640516 is about 294.8779194181.

The spelling of 25640516 in words is "twenty-five million, six hundred forty thousand, five hundred sixteen".