87721023 has 32 divisors (see below), whose sum is σ = 130233600. Its totient is φ = 52183296.

The previous prime is 87721019. The next prime is 87721031. The reversal of 87721023 is 32012778.

It is not a de Polignac number, because 87721023 - 2² = 87721019 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87721013) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 153883 + ... + 154451.

It is an arithmetic number, because the mean of its divisors is an integer number (4069800).

Almost surely, 2^87721023 is an apocalyptic number.

87721023 is a deficient number, since it is larger than the sum of its proper divisors (42512577).

87721023 is a wasteful number, since it uses less digits than its factorization.

87721023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 711.

The product of its (nonzero) digits is 4704, while the sum is 30.

The square root of 87721023 is about 9365.9501920521. The cubic root of 87721023 is about 444.3254907742.

The spelling of 87721023 in words is "eighty-seven million, seven hundred twenty-one thousand, twenty-three".