87131992 has 16 divisors (see below), whose sum is σ = 163497600. Its totient is φ = 43532640.

The previous prime is 87131977. The next prime is 87131999. The reversal of 87131992 is 29913178.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87131999) 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, 9609 + ... + 16327.

It is an arithmetic number, because the mean of its divisors is an integer number (10218600).

Almost surely, 2^87131992 is an apocalyptic number.

It is an amenable number.

87131992 is a deficient number, since it is larger than the sum of its proper divisors (76365608).

87131992 is a wasteful number, since it uses less digits than its factorization.

87131992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8346 (or 8342 counting only the distinct ones).

The product of its digits is 27216, while the sum is 40.

The square root of 87131992 is about 9334.4518853546. The cubic root of 87131992 is about 443.3287343195.

The spelling of 87131992 in words is "eighty-seven million, one hundred thirty-one thousand, nine hundred ninety-two".