87155020 has 24 divisors (see below), whose sum is σ = 184472064. Its totient is φ = 34586496.

The previous prime is 87155009. The next prime is 87155041. The reversal of 87155020 is 2055178.

It is a super-2 number, since 2×87155020² = 15191995022400800, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 87155020.

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, 14617 + ... + 19696.

It is an arithmetic number, because the mean of its divisors is an integer number (7686336).

Almost surely, 2^87155020 is an apocalyptic number.

It is an amenable number.

87155020 is an abundant number, since it is smaller than the sum of its proper divisors (97317044).

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

87155020 is a wasteful number, since it uses less digits than its factorization.

87155020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34449 (or 34447 counting only the distinct ones).

The product of its (nonzero) digits is 2800, while the sum is 28.

The square root of 87155020 is about 9335.6852988948. The cubic root of 87155020 is about 443.3677864695.

The spelling of 87155020 in words is "eighty-seven million, one hundred fifty-five thousand, twenty".