87644025 has 96 divisors (see below), whose sum is σ = 187091200. Its totient is φ = 39890880.

The previous prime is 87643999. The next prime is 87644041. The reversal of 87644025 is 52044678.

87644025 is a `hidden beast` number, since 8 + 7 + 644 + 0 + 2 + 5 = 666.

It is not a de Polignac number, because 87644025 - 2⁸ = 87643769 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 382611 + ... + 382839.

Almost surely, 2^87644025 is an apocalyptic number.

It is an amenable number.

87644025 is an abundant number, since it is smaller than the sum of its proper divisors (99447175).

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

87644025 is an equidigital number, since it uses as much as digits as its factorization.

87644025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 267 (or 244 counting only the distinct ones).

The product of its (nonzero) digits is 53760, while the sum is 36.

The square root of 87644025 is about 9361.8387616963. The cubic root of 87644025 is about 444.1954490127.

The spelling of 87644025 in words is "eighty-seven million, six hundred forty-four thousand, twenty-five".