25631604 has 36 divisors (see below), whose sum is σ = 65276484. Its totient is φ = 8479872.

The previous prime is 25631603. The next prime is 25631611. The reversal of 25631604 is 40613652.

25631604 is a `hidden beast` number, since 2 + 56 + 3 + 1 + 604 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 13395600 + 12236004 = 3660^2 + 3498^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×25631604² = 1313958247225632, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25631603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2334 + ... + 7530.

Almost surely, 2^25631604 is an apocalyptic number.

It is an amenable number.

25631604 is an abundant number, since it is smaller than the sum of its proper divisors (39644880).

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

25631604 is a wasteful number, since it uses less digits than its factorization.

25631604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5344 (or 5339 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 25631604 is about 5062.7664374332. The cubic root of 25631604 is about 294.8437514038.

The spelling of 25631604 in words is "twenty-five million, six hundred thirty-one thousand, six hundred four".