87138020 has 24 divisors (see below), whose sum is σ = 183955968. Its totient is φ = 34671200.

The previous prime is 87138019. The next prime is 87138041. The reversal of 87138020 is 2083178.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7586 + ... + 15225.

It is an arithmetic number, because the mean of its divisors is an integer number (7664832).

Almost surely, 2^87138020 is an apocalyptic number.

It is an amenable number.

87138020 is an abundant number, since it is smaller than the sum of its proper divisors (96817948).

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

87138020 is a wasteful number, since it uses less digits than its factorization.

87138020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23011 (or 23009 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 29.

The square root of 87138020 is about 9334.7747696450. The cubic root of 87138020 is about 443.3389575985.

The spelling of 87138020 in words is "eighty-seven million, one hundred thirty-eight thousand, twenty".