25640616 has 32 divisors (see below), whose sum is σ = 64260000. Its totient is φ = 8525760.

The previous prime is 25640603. The next prime is 25640617. The reversal of 25640616 is 61604652.

It is not an unprimeable number, because it can be changed into a prime (25640617) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 10906 + ... + 13046.

It is an arithmetic number, because the mean of its divisors is an integer number (2008125).

Almost surely, 2^25640616 is an apocalyptic number.

It is an amenable number.

25640616 is an abundant number, since it is smaller than the sum of its proper divisors (38619384).

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

25640616 is a wasteful number, since it uses less digits than its factorization.

25640616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2649 (or 2645 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 30.

The square root of 25640616 is about 5063.6563864465. The cubic root of 25640616 is about 294.8783027665.

The spelling of 25640616 in words is "twenty-five million, six hundred forty thousand, six hundred sixteen".