87579831 has 4 divisors (see below), whose sum is σ = 116773112. Its totient is φ = 58386552.

The previous prime is 87579773. The next prime is 87579841. The reversal of 87579831 is 13897578.

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

It is not a de Polignac number, because 87579831 - 2¹⁰ = 87578807 is a prime.

It is a super-2 number, since 2×87579831² = 15340453595977122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87579841) 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, 14596636 + ... + 14596641.

It is an arithmetic number, because the mean of its divisors is an integer number (29193278).

Almost surely, 2^87579831 is an apocalyptic number.

87579831 is a deficient number, since it is larger than the sum of its proper divisors (29193281).

87579831 is a wasteful number, since it uses less digits than its factorization.

87579831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29193280.

The product of its digits is 423360, while the sum is 48.

The square root of 87579831 is about 9358.4096405319. The cubic root of 87579831 is about 444.0869736688.

It can be divided in two parts, 87579 and 831, that added together give a triangular number (88410 = T₄₂₀).

The spelling of 87579831 in words is "eighty-seven million, five hundred seventy-nine thousand, eight hundred thirty-one".