90587220891 has 16 divisors (see below), whose sum is σ = 124898644224. Its totient is φ = 58367653344.

The previous prime is 90587220853. The next prime is 90587220947. The reversal of 90587220891 is 19802278509.

It is not a de Polignac number, because 90587220891 - 2²² = 90583026587 is a prime.

It is not an unprimeable number, because it can be changed into a prime (90587220811) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4241071 + ... + 4262376.

It is an arithmetic number, because the mean of its divisors is an integer number (7806165264).

Almost surely, 2^90587220891 is an apocalyptic number.

90587220891 is a deficient number, since it is larger than the sum of its proper divisors (34311423333).

90587220891 is a wasteful number, since it uses less digits than its factorization.

90587220891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8503570.

The product of its (nonzero) digits is 725760, while the sum is 51.

The spelling of 90587220891 in words is "ninety billion, five hundred eighty-seven million, two hundred twenty thousand, eight hundred ninety-one".