87613978 has 12 divisors (see below), whose sum is σ = 138703050. Its totient is φ = 41501016.

The previous prime is 87613961. The next prime is 87613991. The reversal of 87613978 is 87931678.

It can be written as a sum of positive squares in only one way, i.e., 84217329 + 3396649 = 9177^2 + 1843^2 .

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, 59953 + ... + 61396.

Almost surely, 2^87613978 is an apocalyptic number.

87613978 is a deficient number, since it is larger than the sum of its proper divisors (51089072).

87613978 is a wasteful number, since it uses less digits than its factorization.

87613978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121389 (or 121370 counting only the distinct ones).

The product of its digits is 508032, while the sum is 49.

The square root of 87613978 is about 9360.2338645998. The cubic root of 87613978 is about 444.1446820374.

The spelling of 87613978 in words is "eighty-seven million, six hundred thirteen thousand, nine hundred seventy-eight".