25644536 has 16 divisors (see below), whose sum is σ = 48171840. Its totient is φ = 12798720.

The previous prime is 25644529. The next prime is 25644581. The reversal of 25644536 is 63544652.

It is a happy number.

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 25644496 and 25644505.

It is a congruent number.

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, 2216 + ... + 7496.

It is an arithmetic number, because the mean of its divisors is an integer number (3010740).

Almost surely, 2^25644536 is an apocalyptic number.

It is an amenable number.

25644536 is a deficient number, since it is larger than the sum of its proper divisors (22527304).

25644536 is a wasteful number, since it uses less digits than its factorization.

25644536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5894 (or 5890 counting only the distinct ones).

The product of its digits is 86400, while the sum is 35.

The square root of 25644536 is about 5064.0434437315. The cubic root of 25644536 is about 294.8933292391.

The spelling of 25644536 in words is "twenty-five million, six hundred forty-four thousand, five hundred thirty-six".