90447075831 has 32 divisors (see below), whose sum is σ = 143139640320. Its totient is φ = 49722114816.

The previous prime is 90447075769. The next prime is 90447075833. The reversal of 90447075831 is 13857074409.

It is a happy number.

It is not a de Polignac number, because 90447075831 - 2²² = 90442881527 is a prime.

It is a super-2 number, since 2×90447075831² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90447075833) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 584811 + ... + 723116.

It is an arithmetic number, because the mean of its divisors is an integer number (4473113760).

Almost surely, 2^90447075831 is an apocalyptic number.

90447075831 is a deficient number, since it is larger than the sum of its proper divisors (52692564489).

90447075831 is a wasteful number, since it uses less digits than its factorization.

90447075831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1308063.

The product of its (nonzero) digits is 846720, while the sum is 48.

The spelling of 90447075831 in words is "ninety billion, four hundred forty-seven million, seventy-five thousand, eight hundred thirty-one".