87139180 has 24 divisors (see below), whose sum is σ = 190949472. Its totient is φ = 33340032.

The previous prime is 87139177. The next prime is 87139183. The reversal of 87139180 is 8193178.

It is an interprime number because it is at equal distance from previous prime (87139177) and next prime (87139183).

It is not an unprimeable number, because it can be changed into a prime (87139183) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 94257 + ... + 95176.

It is an arithmetic number, because the mean of its divisors is an integer number (7956228).

Almost surely, 2^87139180 is an apocalyptic number.

It is an amenable number.

87139180 is an abundant number, since it is smaller than the sum of its proper divisors (103810292).

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

87139180 is a wasteful number, since it uses less digits than its factorization.

87139180 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 189465 (or 189463 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 37.

The square root of 87139180 is about 9334.8369026995. The cubic root of 87139180 is about 443.3409248642.

The spelling of 87139180 in words is "eighty-seven million, one hundred thirty-nine thousand, one hundred eighty".