87968721 has 16 divisors (see below), whose sum is σ = 125702784. Its totient is φ = 54578304.

The previous prime is 87968717. The next prime is 87968729. The reversal of 87968721 is 12786978.

It is not a de Polignac number, because 87968721 - 2² = 87968717 is a prime.

It is not an unprimeable number, because it can be changed into a prime (87968729) 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, 14676 + ... + 19781.

It is an arithmetic number, because the mean of its divisors is an integer number (7856424).

Almost surely, 2^87968721 is an apocalyptic number.

It is an amenable number.

87968721 is a deficient number, since it is larger than the sum of its proper divisors (37734063).

87968721 is a wasteful number, since it uses less digits than its factorization.

87968721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34520.

The product of its digits is 338688, while the sum is 48.

The square root of 87968721 is about 9379.1641951722. The cubic root of 87968721 is about 444.7433119647.

The spelling of 87968721 in words is "eighty-seven million, nine hundred sixty-eight thousand, seven hundred twenty-one".