25397664 has 24 divisors (see below), whose sum is σ = 66669120. Its totient is φ = 8465856.

The previous prime is 25397657. The next prime is 25397731. The reversal of 25397664 is 46679352.

It is a tau number, because it is divible by the number of its divisors (24).

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, 132184 + ... + 132375.

It is an arithmetic number, because the mean of its divisors is an integer number (2777880).

Almost surely, 2^25397664 is an apocalyptic number.

25397664 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

25397664 is an abundant number, since it is smaller than the sum of its proper divisors (41271456).

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

25397664 is a wasteful number, since it uses less digits than its factorization.

25397664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 264572 (or 264564 counting only the distinct ones).

The product of its digits is 272160, while the sum is 42.

The square root of 25397664 is about 5039.6095086822. The cubic root of 25397664 is about 293.9439941446.

The spelling of 25397664 in words is "twenty-five million, three hundred ninety-seven thousand, six hundred sixty-four".