25197564 has 36 divisors (see below), whose sum is σ = 68394984. Its totient is φ = 7199136.

The previous prime is 25197563. The next prime is 25197577. The reversal of 25197564 is 46579152.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25197563) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20839 + ... + 22014.

Almost surely, 2^25197564 is an apocalyptic number.

It is an amenable number.

25197564 is an abundant number, since it is smaller than the sum of its proper divisors (43197420).

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

25197564 is a wasteful number, since it uses less digits than its factorization.

25197564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42874 (or 42865 counting only the distinct ones).

The product of its digits is 75600, while the sum is 39.

The square root of 25197564 is about 5019.7175219329. The cubic root of 25197564 is about 293.1699945781.

The spelling of 25197564 in words is "twenty-five million, one hundred ninety-seven thousand, five hundred sixty-four".