25662642 has 16 divisors (see below), whose sum is σ = 51585600. Its totient is φ = 8510832.

The previous prime is 25662619. The next prime is 25662643. The reversal of 25662642 is 24626652.

It is not an unprimeable number, because it can be changed into a prime (25662643) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9553 + ... + 11940.

It is an arithmetic number, because the mean of its divisors is an integer number (3224100).

Almost surely, 2^25662642 is an apocalyptic number.

25662642 is an abundant number, since it is smaller than the sum of its proper divisors (25922958).

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

25662642 is a wasteful number, since it uses less digits than its factorization.

25662642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21697.

The product of its digits is 34560, while the sum is 33.

The square root of 25662642 is about 5065.8308301798. The cubic root of 25662642 is about 294.9627148127.

The spelling of 25662642 in words is "twenty-five million, six hundred sixty-two thousand, six hundred forty-two".