25640650 has 24 divisors (see below), whose sum is σ = 54505440. Its totient is φ = 8790960.

The previous prime is 25640639. The next prime is 25640663. The reversal of 25640650 is 5604652.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 36280 + ... + 36979.

It is an arithmetic number, because the mean of its divisors is an integer number (2271060).

Almost surely, 2^25640650 is an apocalyptic number.

25640650 is an abundant number, since it is smaller than the sum of its proper divisors (28864790).

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

25640650 is a wasteful number, since it uses less digits than its factorization.

25640650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73278 (or 73273 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 28.

The square root of 25640650 is about 5063.6597437032. The cubic root of 25640650 is about 294.8784331047.

The spelling of 25640650 in words is "twenty-five million, six hundred forty thousand, six hundred fifty".