25640442 has 32 divisors (see below), whose sum is σ = 57158400. Its totient is φ = 8519904.

The previous prime is 25640429. The next prime is 25640453. The reversal of 25640442 is 24404652.

25640442 is a `hidden beast` number, since 256 + 404 + 4 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24159 + ... + 25197.

It is an arithmetic number, because the mean of its divisors is an integer number (1786200).

Almost surely, 2^25640442 is an apocalyptic number.

25640442 is an abundant number, since it is smaller than the sum of its proper divisors (31517958).

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

25640442 is a wasteful number, since it uses less digits than its factorization.

25640442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1507 (or 1501 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 27.

The square root of 25640442 is about 5063.6392051567. The cubic root of 25640442 is about 294.8776357396.

The spelling of 25640442 in words is "twenty-five million, six hundred forty thousand, four hundred forty-two".