87091240 has 16 divisors (see below), whose sum is σ = 195955380. Its totient is φ = 34836480.

The previous prime is 87091201. The next prime is 87091253. The reversal of 87091240 is 4219078.

It can be written as a sum of positive squares in 2 ways, for example, as 86974276 + 116964 = 9326^2 + 342^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1088601 + ... + 1088680.

Almost surely, 2^87091240 is an apocalyptic number.

It is an amenable number.

87091240 is an abundant number, since it is smaller than the sum of its proper divisors (108864140).

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

87091240 is a wasteful number, since it uses less digits than its factorization.

87091240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2177292 (or 2177288 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 87091240 is about 9332.2687488092. The cubic root of 87091240 is about 443.2596079688.

The spelling of 87091240 in words is "eighty-seven million, ninety-one thousand, two hundred forty".