25561972 has 12 divisors (see below), whose sum is σ = 45346756. Its totient is φ = 12605760.

The previous prime is 25561969. The next prime is 25561997. The reversal of 25561972 is 27916552.

It can be written as a sum of positive squares in 2 ways, for example, as 12916836 + 12645136 = 3594^2 + 3556^2 .

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 43479 + ... + 44062.

Almost surely, 2^25561972 is an apocalyptic number.

It is an amenable number.

25561972 is a deficient number, since it is larger than the sum of its proper divisors (19784784).

25561972 is a wasteful number, since it uses less digits than its factorization.

25561972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87618 (or 87616 counting only the distinct ones).

The product of its digits is 37800, while the sum is 37.

The square root of 25561972 is about 5055.8848879301. The cubic root of 25561972 is about 294.5765138738.

The spelling of 25561972 in words is "twenty-five million, five hundred sixty-one thousand, nine hundred seventy-two".