90916881 has 32 divisors (see below), whose sum is σ = 143001600. Its totient is φ = 50777280.

The previous prime is 90916853. The next prime is 90916883. The reversal of 90916881 is 18861909.

It is not a de Polignac number, because 90916881 - 2⁹ = 90916369 is a prime.

It is a super-2 number, since 2×90916881² = 16531758501536322, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (90916883) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 21240 + ... + 25158.

It is an arithmetic number, because the mean of its divisors is an integer number (4468800).

Almost surely, 2^90916881 is an apocalyptic number.

It is an amenable number.

90916881 is a deficient number, since it is larger than the sum of its proper divisors (52084719).

90916881 is a wasteful number, since it uses less digits than its factorization.

90916881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3989.

The product of its (nonzero) digits is 31104, while the sum is 42.

The square root of 90916881 is about 9535.0343995184. The cubic root of 90916881 is about 449.6571561460.

The spelling of 90916881 in words is "ninety million, nine hundred sixteen thousand, eight hundred eighty-one".