90639548091 has 48 divisors (see below), whose sum is σ = 147024072000. Its totient is φ = 53507266560.

The previous prime is 90639548047. The next prime is 90639548099. The reversal of 90639548091 is 19084593609.

90639548091 is a `hidden beast` number, since 9 + 0 + 6 + 3 + 9 + 548 + 0 + 91 = 666.

It is not a de Polignac number, because 90639548091 - 2⁷ = 90639547963 is a prime.

It is not an unprimeable number, because it can be changed into a prime (90639548099) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3535 + ... + 425783.

It is an arithmetic number, because the mean of its divisors is an integer number (3063001500).

Almost surely, 2^90639548091 is an apocalyptic number.

90639548091 is a deficient number, since it is larger than the sum of its proper divisors (56384523909).

90639548091 is a wasteful number, since it uses less digits than its factorization.

90639548091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 422356 (or 422353 counting only the distinct ones).

The product of its (nonzero) digits is 2099520, while the sum is 54.

The spelling of 90639548091 in words is "ninety billion, six hundred thirty-nine million, five hundred forty-eight thousand, ninety-one".