87815799 has 16 divisors (see below), whose sum is σ = 134584800. Its totient is φ = 56524608.

The previous prime is 87815779. The next prime is 87815807. The reversal of 87815799 is 99751878.

It is not a de Polignac number, because 87815799 - 2⁷ = 87815671 is a prime.

It is a super-2 number, since 2×87815799² = 15423229108016802, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87815779) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 55294 + ... + 56859.

It is an arithmetic number, because the mean of its divisors is an integer number (8411550).

Almost surely, 2^87815799 is an apocalyptic number.

87815799 is a deficient number, since it is larger than the sum of its proper divisors (46769001).

87815799 is a wasteful number, since it uses less digits than its factorization.

87815799 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112191 (or 112185 counting only the distinct ones).

The product of its digits is 1270080, while the sum is 54.

The square root of 87815799 is about 9371.0084302598. The cubic root of 87815799 is about 444.4854533248.

The spelling of 87815799 in words is "eighty-seven million, eight hundred fifteen thousand, seven hundred ninety-nine".