86379431779 has 4 divisors (see below), whose sum is σ = 87000866680. Its totient is φ = 85757996880.

The previous prime is 86379431729. The next prime is 86379431807. The reversal of 86379431779 is 97713497368.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 86379431779 - 2⁹ = 86379431267 is a prime.

It is a super-2 number, since 2×86379431779² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 86379431779.

It is not an unprimeable number, because it can be changed into a prime (86379431729) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 310717242 + ... + 310717519.

It is an arithmetic number, because the mean of its divisors is an integer number (21750216670).

Almost surely, 2^86379431779 is an apocalyptic number.

86379431779 is a deficient number, since it is larger than the sum of its proper divisors (621434901).

86379431779 is a wasteful number, since it uses less digits than its factorization.

86379431779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 621434900.

The product of its digits is 48009024, while the sum is 64.

The spelling of 86379431779 in words is "eighty-six billion, three hundred seventy-nine million, four hundred thirty-one thousand, seven hundred seventy-nine".