86913815 has 4 divisors (see below), whose sum is σ = 104296584. Its totient is φ = 69531048.

The previous prime is 86913797. The next prime is 86913817. The reversal of 86913815 is 51831968.

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 86913815 - 2²⁰ = 85865239 is a prime.

It is a super-2 number, since 2×86913815² = 15108022475708450, which 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 (86913817) 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, 8691377 + ... + 8691386.

It is an arithmetic number, because the mean of its divisors is an integer number (26074146).

Almost surely, 2^86913815 is an apocalyptic number.

86913815 is a deficient number, since it is larger than the sum of its proper divisors (17382769).

86913815 is a wasteful number, since it uses less digits than its factorization.

86913815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17382768.

The product of its digits is 51840, while the sum is 41.

The square root of 86913815 is about 9322.7579074006. The cubic root of 86913815 is about 442.9583958809.

The spelling of 86913815 in words is "eighty-six million, nine hundred thirteen thousand, eight hundred fifteen".