87690978 has 16 divisors (see below), whose sum is σ = 194868960. Its totient is φ = 29230308.

The previous prime is 87690949. The next prime is 87691003. The reversal of 87690978 is 87909678.

It is a Harshad number since it is a multiple of its sum of digits (54), and also a Moran number because the ratio is a prime number: 1623907 = 87690978 / (8 + 7 + 6 + 9 + 0 + 9 + 7 + 8).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 811900 + ... + 812007.

It is an arithmetic number, because the mean of its divisors is an integer number (12179310).

Almost surely, 2^87690978 is an apocalyptic number.

87690978 is an abundant number, since it is smaller than the sum of its proper divisors (107177982).

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

87690978 is a wasteful number, since it uses less digits than its factorization.

87690978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1623918 (or 1623912 counting only the distinct ones).

The product of its (nonzero) digits is 1524096, while the sum is 54.

The square root of 87690978 is about 9364.3461063760. The cubic root of 87690978 is about 444.2747568933.

The spelling of 87690978 in words is "eighty-seven million, six hundred ninety thousand, nine hundred seventy-eight".