87511983 has 32 divisors (see below), whose sum is σ = 129136896. Its totient is φ = 52386048.

The previous prime is 87511981. The next prime is 87511997. The reversal of 87511983 is 38911578.

It is not a de Polignac number, because 87511983 - 2¹ = 87511981 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87511981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 279435 + ... + 279747.

It is an arithmetic number, because the mean of its divisors is an integer number (4035528).

Almost surely, 2^87511983 is an apocalyptic number.

87511983 is a deficient number, since it is larger than the sum of its proper divisors (41624913).

87511983 is a wasteful number, since it uses less digits than its factorization.

87511983 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 503.

The product of its digits is 60480, while the sum is 42.

The square root of 87511983 is about 9354.7839632992. The cubic root of 87511983 is about 443.9722661437.

The spelling of 87511983 in words is "eighty-seven million, five hundred eleven thousand, nine hundred eighty-three".