87139788 has 24 divisors (see below), whose sum is σ = 203606592. Its totient is φ = 29006544.

The previous prime is 87139771. The next prime is 87139823. The reversal of 87139788 is 88793178.

It is a self number, because there is not a number n which added to its sum of digits gives 87139788.

It is an unprimeable number.

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, 4831 + ... + 14057.

It is an arithmetic number, because the mean of its divisors is an integer number (8483608).

Almost surely, 2^87139788 is an apocalyptic number.

It is an amenable number.

87139788 is an abundant number, since it is smaller than the sum of its proper divisors (116466804).

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

87139788 is a wasteful number, since it uses less digits than its factorization.

87139788 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10021 (or 10019 counting only the distinct ones).

The product of its digits is 677376, while the sum is 51.

The square root of 87139788 is about 9334.8694688249. The cubic root of 87139788 is about 443.3419559758.

The spelling of 87139788 in words is "eighty-seven million, one hundred thirty-nine thousand, seven hundred eighty-eight".