87815858 has 16 divisors (see below), whose sum is σ = 142490880. Its totient is φ = 40349136.

The previous prime is 87815831. The next prime is 87815873. The reversal of 87815858 is 85851878.

It is a happy number.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1538 + ... + 13341.

It is an arithmetic number, because the mean of its divisors is an integer number (8905680).

Almost surely, 2^87815858 is an apocalyptic number.

87815858 is a deficient number, since it is larger than the sum of its proper divisors (54675022).

87815858 is a wasteful number, since it uses less digits than its factorization.

87815858 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15121.

The product of its digits is 716800, while the sum is 50.

The square root of 87815858 is about 9371.0115782662. The cubic root of 87815858 is about 444.4855528689.

The spelling of 87815858 in words is "eighty-seven million, eight hundred fifteen thousand, eight hundred fifty-eight".