87139860 has 48 divisors (see below), whose sum is σ = 244944000. Its totient is φ = 23146624.

The previous prime is 87139859. The next prime is 87139861. The reversal of 87139860 is 6893178.

It is an interprime number because it is at equal distance from previous prime (87139859) and next prime (87139861).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87139861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13441 + ... + 18839.

It is an arithmetic number, because the mean of its divisors is an integer number (5103000).

Almost surely, 2^87139860 is an apocalyptic number.

It is an amenable number.

87139860 is an abundant number, since it is smaller than the sum of its proper divisors (157804140).

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

87139860 is a wasteful number, since it uses less digits than its factorization.

87139860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5680 (or 5678 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 42.

The square root of 87139860 is about 9334.8733253323. The cubic root of 87139860 is about 443.3420780808.

The spelling of 87139860 in words is "eighty-seven million, one hundred thirty-nine thousand, eight hundred sixty".