86715209778 has 16 divisors (see below), whose sum is σ = 175806179616. Its totient is φ = 28509109920.

The previous prime is 86715209719. The next prime is 86715209813. The reversal of 86715209778 is 87790251768.

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, 98989528 + ... + 98990403.

It is an arithmetic number, because the mean of its divisors is an integer number (10987886226).

Almost surely, 2^86715209778 is an apocalyptic number.

86715209778 is an abundant number, since it is smaller than the sum of its proper divisors (89090969838).

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

86715209778 is a wasteful number, since it uses less digits than its factorization.

86715209778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 197980009.

The product of its (nonzero) digits is 11854080, while the sum is 60.

The spelling of 86715209778 in words is "eighty-six billion, seven hundred fifteen million, two hundred nine thousand, seven hundred seventy-eight".