87195231978 has 16 divisors (see below), whose sum is σ = 175053548736. Its totient is φ = 28954563200.

The previous prime is 87195231941. The next prime is 87195232039. The reversal of 87195231978 is 87913259178.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27626823 + ... + 27629978.

It is an arithmetic number, because the mean of its divisors is an integer number (10940846796).

Almost surely, 2^87195231978 is an apocalyptic number.

87195231978 is an abundant number, since it is smaller than the sum of its proper divisors (87858316758).

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

87195231978 is a wasteful number, since it uses less digits than its factorization.

87195231978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55257069.

The product of its digits is 7620480, while the sum is 60.

The spelling of 87195231978 in words is "eighty-seven billion, one hundred ninety-five million, two hundred thirty-one thousand, nine hundred seventy-eight".