87318612 has 36 divisors (see below), whose sum is σ = 223210260. Its totient is φ = 28778112.

The previous prime is 87318607. The next prime is 87318617. The reversal of 87318612 is 21681378.

87318612 is a `hidden beast` number, since 8 + 7 + 31 + 8 + 612 = 666.

It is an interprime number because it is at equal distance from previous prime (87318607) and next prime (87318617).

It can be written as a sum of positive squares in 2 ways, for example, as 30074256 + 57244356 = 5484^2 + 7566^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87318617) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10423 + ... + 16830.

It is an arithmetic number, because the mean of its divisors is an integer number (6200285).

Almost surely, 2^87318612 is an apocalyptic number.

It is an amenable number.

87318612 is an abundant number, since it is smaller than the sum of its proper divisors (135891648).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

87318612 is a wasteful number, since it uses less digits than its factorization.

87318612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27352 (or 27347 counting only the distinct ones).

The product of its digits is 16128, while the sum is 36.

The square root of 87318612 is about 9344.4428405336. The cubic root of 87318612 is about 443.6450169688.

The spelling of 87318612 in words is "eighty-seven million, three hundred eighteen thousand, six hundred twelve".