87998638 has 32 divisors (see below), whose sum is σ = 163477440. Its totient is φ = 34800480.

The previous prime is 87998609. The next prime is 87998663. The reversal of 87998638 is 83689978.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29328 + ... + 32188.

It is an arithmetic number, because the mean of its divisors is an integer number (5108670).

Almost surely, 2^87998638 is an apocalyptic number.

87998638 is a deficient number, since it is larger than the sum of its proper divisors (75478802).

87998638 is a wasteful number, since it uses less digits than its factorization.

87998638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2909 (or 2883 counting only the distinct ones).

The product of its digits is 5225472, while the sum is 58.

The square root of 87998638 is about 9380.7589245220. The cubic root of 87998638 is about 444.7937233589.

The spelling of 87998638 in words is "eighty-seven million, nine hundred ninety-eight thousand, six hundred thirty-eight".