87991833 has 16 divisors (see below), whose sum is σ = 119658240. Its totient is φ = 57499344.

The previous prime is 87991817. The next prime is 87991861. The reversal of 87991833 is 33819978.

It is not a de Polignac number, because 87991833 - 2⁴ = 87991817 is a prime.

It is not an unprimeable number, because it can be changed into a prime (87991873) 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, 99210 + ... + 100092.

It is an arithmetic number, because the mean of its divisors is an integer number (7478640).

Almost surely, 2^87991833 is an apocalyptic number.

It is an amenable number.

87991833 is a deficient number, since it is larger than the sum of its proper divisors (31666407).

87991833 is a wasteful number, since it uses less digits than its factorization.

87991833 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1508.

The product of its digits is 326592, while the sum is 48.

The square root of 87991833 is about 9380.3962069840. The cubic root of 87991833 is about 444.7822576538.

The spelling of 87991833 in words is "eighty-seven million, nine hundred ninety-one thousand, eight hundred thirty-three".