90864452081 has 16 divisors (see below), whose sum is σ = 99536808000. Its totient is φ = 82433187648.

The previous prime is 90864452059. The next prime is 90864452089. The reversal of 90864452081 is 18025446809.

It is not a de Polignac number, because 90864452081 - 2²² = 90860257777 is a prime.

It is a super-2 number, since 2×90864452081² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90864452089) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3790070 + ... + 3813968.

It is an arithmetic number, because the mean of its divisors is an integer number (6221050500).

Almost surely, 2^90864452081 is an apocalyptic number.

It is an amenable number.

90864452081 is a deficient number, since it is larger than the sum of its proper divisors (8672355919).

90864452081 is a wasteful number, since it uses less digits than its factorization.

90864452081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28928.

The product of its (nonzero) digits is 552960, while the sum is 47.

The spelling of 90864452081 in words is "ninety billion, eight hundred sixty-four million, four hundred fifty-two thousand, eighty-one".