87993815 has 16 divisors (see below), whose sum is σ = 129960768. Its totient is φ = 55696896.

The previous prime is 87993797. The next prime is 87993817. The reversal of 87993815 is 51839978.

It is a cyclic number.

It is not a de Polignac number, because 87993815 - 2⁸ = 87993559 is a prime.

It is a super-2 number, since 2×87993815² = 15485822956508450, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87993817) 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, 96242 + ... + 97151.

It is an arithmetic number, because the mean of its divisors is an integer number (8122548).

Almost surely, 2^87993815 is an apocalyptic number.

87993815 is a deficient number, since it is larger than the sum of its proper divisors (41966953).

87993815 is a wasteful number, since it uses less digits than its factorization.

87993815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 193418.

The product of its digits is 544320, while the sum is 50.

The square root of 87993815 is about 9380.5018522465. The cubic root of 87993815 is about 444.7855971751.

The spelling of 87993815 in words is "eighty-seven million, nine hundred ninety-three thousand, eight hundred fifteen".