25664544 has 36 divisors (see below), whose sum is σ = 72984366. Its totient is φ = 8554752.

The previous prime is 25664531. The next prime is 25664557. The reversal of 25664544 is 44546652.

25664544 is a `hidden beast` number, since 2 + 5 + 6 + 645 + 4 + 4 = 666.

It is an interprime number because it is at equal distance from previous prime (25664531) and next prime (25664557).

It can be written as a sum of positive squares in only one way, i.e., 22467600 + 3196944 = 4740^2 + 1788^2 .

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

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 25664499 and 25664508.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 44269 + ... + 44844.

Almost surely, 2^25664544 is an apocalyptic number.

25664544 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

25664544 is an abundant number, since it is smaller than the sum of its proper divisors (47319822).

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

25664544 is a wasteful number, since it uses less digits than its factorization.

25664544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89129 (or 89118 counting only the distinct ones).

The product of its digits is 115200, while the sum is 36.

The square root of 25664544 is about 5066.0185550391. The cubic root of 25664544 is about 294.9700017375.

The spelling of 25664544 in words is "twenty-five million, six hundred sixty-four thousand, five hundred forty-four".