86779391 has 16 divisors (see below), whose sum is σ = 92954304. Its totient is φ = 80830464.

The previous prime is 86779351. The next prime is 86779409. The reversal of 86779391 is 19397768.

It is not a de Polignac number, because 86779391 - 2¹⁴ = 86763007 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (86779331) 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, 313145 + ... + 313421.

It is an arithmetic number, because the mean of its divisors is an integer number (5809644).

Almost surely, 2^86779391 is an apocalyptic number.

86779391 is a deficient number, since it is larger than the sum of its proper divisors (6174913).

86779391 is a wasteful number, since it uses less digits than its factorization.

86779391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 610.

The product of its digits is 571536, while the sum is 50.

The square root of 86779391 is about 9315.5456630302. The cubic root of 86779391 is about 442.7299129730.

The spelling of 86779391 in words is "eighty-six million, seven hundred seventy-nine thousand, three hundred ninety-one".