87636987 has 12 divisors (see below), whose sum is σ = 133249480. Its totient is φ = 55349568.

The previous prime is 87636977. The next prime is 87637009. The reversal of 87636987 is 78963678.

It is not a de Polignac number, because 87636987 - 2⁴ = 87636971 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87636937) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 256078 + ... + 256419.

Almost surely, 2^87636987 is an apocalyptic number.

87636987 is a deficient number, since it is larger than the sum of its proper divisors (45612493).

87636987 is a wasteful number, since it uses less digits than its factorization.

87636987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 512522 (or 512519 counting only the distinct ones).

The product of its digits is 3048192, while the sum is 54.

The square root of 87636987 is about 9361.4628664542. The cubic root of 87636987 is about 444.1835587507.

The spelling of 87636987 in words is "eighty-seven million, six hundred thirty-six thousand, nine hundred eighty-seven".