86912871978 has 16 divisors (see below), whose sum is σ = 175152659616. Its totient is φ = 28749804720.

The previous prime is 86912871959. The next prime is 86912871979. The reversal of 86912871978 is 87917821968.

It is not an unprimeable number, because it can be changed into a prime (86912871979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 55287301 + ... + 55288872.

It is an arithmetic number, because the mean of its divisors is an integer number (10947041226).

Almost surely, 2^86912871978 is an apocalyptic number.

86912871978 is an abundant number, since it is smaller than the sum of its proper divisors (88239787638).

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

86912871978 is a wasteful number, since it uses less digits than its factorization.

86912871978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110576309.

The product of its digits is 24385536, while the sum is 66.

The spelling of 86912871978 in words is "eighty-six billion, nine hundred twelve million, eight hundred seventy-one thousand, nine hundred seventy-eight".