25639012 has 24 divisors (see below), whose sum is σ = 51571520. Its totient is φ = 10925280.

The previous prime is 25638989. The next prime is 25639013. The reversal of 25639012 is 21093652.

It is a super-2 number, since 2×25639012² = 1314717872672288, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is not an unprimeable number, because it can be changed into a prime (25639013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2539 + ... + 7597.

Almost surely, 2^25639012 is an apocalyptic number.

It is an amenable number.

25639012 is an abundant number, since it is smaller than the sum of its proper divisors (25932508).

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

25639012 is a wasteful number, since it uses less digits than its factorization.

25639012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5251 (or 5249 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 28.

The square root of 25639012 is about 5063.4980003946. The cubic root of 25639012 is about 294.8721537377.

The spelling of 25639012 in words is "twenty-five million, six hundred thirty-nine thousand, twelve".