86256978239 has 16 divisors (see below), whose sum is σ = 89553321984. Its totient is φ = 82993723200.

The previous prime is 86256978209. The next prime is 86256978257. The reversal of 86256978239 is 93287965268.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-86256978239 is a prime.

It is a super-2 number, since 2×86256978239² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (86256978209) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5681819 + ... + 5696979.

It is an arithmetic number, because the mean of its divisors is an integer number (5597082624).

Almost surely, 2^86256978239 is an apocalyptic number.

86256978239 is a deficient number, since it is larger than the sum of its proper divisors (3296343745).

86256978239 is a wasteful number, since it uses less digits than its factorization.

86256978239 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16238.

The product of its digits is 78382080, while the sum is 65.

The spelling of 86256978239 in words is "eighty-six billion, two hundred fifty-six million, nine hundred seventy-eight thousand, two hundred thirty-nine".