87090291 has 6 divisors (see below), whose sum is σ = 125797100. Its totient is φ = 58060188.

The previous prime is 87090271. The next prime is 87090293. The reversal of 87090291 is 19209078.

It is a happy number.

It is not a de Polignac number, because 87090291 - 2⁷ = 87090163 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87090293) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4838341 + ... + 4838358.

Almost surely, 2^87090291 is an apocalyptic number.

87090291 is a deficient number, since it is larger than the sum of its proper divisors (38706809).

87090291 is a wasteful number, since it uses less digits than its factorization.

87090291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9676705 (or 9676702 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 36.

The square root of 87090291 is about 9332.2179035854. The cubic root of 87090291 is about 443.2579979527.

The spelling of 87090291 in words is "eighty-seven million, ninety thousand, two hundred ninety-one".