86787215 has 4 divisors (see below), whose sum is σ = 104144664. Its totient is φ = 69429768.

The previous prime is 86787209. The next prime is 86787229. The reversal of 86787215 is 51278768.

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 86787215 - 2⁴ = 86787199 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8678717 + ... + 8678726.

It is an arithmetic number, because the mean of its divisors is an integer number (26036166).

Almost surely, 2^86787215 is an apocalyptic number.

86787215 is a deficient number, since it is larger than the sum of its proper divisors (17357449).

86787215 is a wasteful number, since it uses less digits than its factorization.

86787215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17357448.

The product of its digits is 188160, while the sum is 44.

The square root of 86787215 is about 9315.9655967591. The cubic root of 86787215 is about 442.7432180320.

The spelling of 86787215 in words is "eighty-six million, seven hundred eighty-seven thousand, two hundred fifteen".