90884891 has 4 divisors (see below), whose sum is σ = 94836432. Its totient is φ = 86933352.

The previous prime is 90884879. The next prime is 90884921. The reversal of 90884891 is 19848809.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 90884891 - 2¹⁸ = 90622747 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90884821) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1975736 + ... + 1975781.

It is an arithmetic number, because the mean of its divisors is an integer number (23709108).

Almost surely, 2^90884891 is an apocalyptic number.

90884891 is a deficient number, since it is larger than the sum of its proper divisors (3951541).

90884891 is a wasteful number, since it uses less digits than its factorization.

90884891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3951540.

The product of its (nonzero) digits is 165888, while the sum is 47.

The square root of 90884891 is about 9533.3567540505. The cubic root of 90884891 is about 449.6044111930.

The spelling of 90884891 in words is "ninety million, eight hundred eighty-four thousand, eight hundred ninety-one".