25561504 has 24 divisors (see below), whose sum is σ = 50776740. Its totient is φ = 12665856.

The previous prime is 25561493. The next prime is 25561507. The reversal of 25561504 is 40516552.

It can be written as a sum of positive squares in 2 ways, for example, as 21641104 + 3920400 = 4652^2 + 1980^2 .

It is not an unprimeable number, because it can be changed into a prime (25561507) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 82 + ... + 7150.

Almost surely, 2^25561504 is an apocalyptic number.

It is an amenable number.

25561504 is a deficient number, since it is larger than the sum of its proper divisors (25215236).

25561504 is a wasteful number, since it uses less digits than its factorization.

25561504 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7192 (or 7184 counting only the distinct ones).

The product of its (nonzero) digits is 6000, while the sum is 28.

The square root of 25561504 is about 5055.8386050190. The cubic root of 25561504 is about 294.5747161167.

The spelling of 25561504 in words is "twenty-five million, five hundred sixty-one thousand, five hundred four".