87085220 has 24 divisors (see below), whose sum is σ = 193637304. Its totient is φ = 32784896.

The previous prime is 87085217. The next prime is 87085241. The reversal of 87085220 is 2258078.

It can be written as a sum of positive squares in 4 ways, for example, as 8514724 + 78570496 = 2918^2 + 8864^2 .

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, 127727 + ... + 128406.

It is an arithmetic number, because the mean of its divisors is an integer number (8068221).

Almost surely, 2^87085220 is an apocalyptic number.

It is an amenable number.

87085220 is an abundant number, since it is smaller than the sum of its proper divisors (106552084).

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

87085220 is a wasteful number, since it uses less digits than its factorization.

87085220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 256159 (or 256157 counting only the distinct ones).

The product of its (nonzero) digits is 8960, while the sum is 32.

The square root of 87085220 is about 9331.9462064459. The cubic root of 87085220 is about 443.2493946021.

The spelling of 87085220 in words is "eighty-seven million, eighty-five thousand, two hundred twenty".