25540644 has 12 divisors (see below), whose sum is σ = 59594864. Its totient is φ = 8513544.

The previous prime is 25540607. The next prime is 25540651. The reversal of 25540644 is 44604552.

It is a tau number, because it is divible by the number of its divisors (12).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1064182 + ... + 1064205.

Almost surely, 2^25540644 is an apocalyptic number.

It is an amenable number.

25540644 is an abundant number, since it is smaller than the sum of its proper divisors (34054220).

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

25540644 is a wasteful number, since it uses less digits than its factorization.

25540644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2128394 (or 2128392 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 30.

The square root of 25540644 is about 5053.7752225440. The cubic root of 25540644 is about 294.4945630230.

The spelling of 25540644 in words is "twenty-five million, five hundred forty thousand, six hundred forty-four".