87091218 has 24 divisors (see below), whose sum is σ = 190433100. Its totient is φ = 28763424.

The previous prime is 87091201. The next prime is 87091253. The reversal of 87091218 is 81219078.

It can be written as a sum of positive squares in 2 ways, for example, as 73051209 + 14040009 = 8547^2 + 3747^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20233 + ... + 24156.

Almost surely, 2^87091218 is an apocalyptic number.

87091218 is an abundant number, since it is smaller than the sum of its proper divisors (103341882).

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

87091218 is a wasteful number, since it uses less digits than its factorization.

87091218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44506 (or 44503 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 36.

The square root of 87091218 is about 9332.2675701032. The cubic root of 87091218 is about 443.2595706451.

The spelling of 87091218 in words is "eighty-seven million, ninety-one thousand, two hundred eighteen".