87999923 has 4 divisors (see below), whose sum is σ = 95999928. Its totient is φ = 79999920.

The previous prime is 87999883. The next prime is 87999929. The reversal of 87999923 is 32999978.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 87999923 - 2⁶ = 87999859 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87999929) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3999986 + ... + 4000007.

It is an arithmetic number, because the mean of its divisors is an integer number (23999982).

Almost surely, 2^87999923 is an apocalyptic number.

87999923 is a deficient number, since it is larger than the sum of its proper divisors (8000005).

87999923 is a wasteful number, since it uses less digits than its factorization.

87999923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8000004.

The product of its digits is 2204496, while the sum is 56.

The square root of 87999923 is about 9380.8274155322. The cubic root of 87999923 is about 444.7958883817.

Subtracting from 87999923 its reverse (32999978), we obtain a palindrome (54999945).

The spelling of 87999923 in words is "eighty-seven million, nine hundred ninety-nine thousand, nine hundred twenty-three".