90431296691328 has 64 divisors (see below), whose sum is σ = 266897924272800. Its totient is φ = 30143765562624.

The previous prime is 90431296691293. The next prime is 90431296691377. The reversal of 90431296691328 is 82319669213409.

90431296691328 is a `hidden beast` number, since 9 + 0 + 43 + 129 + 66 + 91 + 328 = 666.

It is a tau number, because it is divible by the number of its divisors (64).

It is a super-2 number, since 2×90431296691328² (a number of 29 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13083228126 + ... + 13083235037.

Almost surely, 2^{90431296691328} is an apocalyptic number.

It is an amenable number.

90431296691328 is an abundant number, since it is smaller than the sum of its proper divisors (176466627581472).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

90431296691328 is a wasteful number, since it uses less digits than its factorization.

90431296691328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26166463186 (or 26166463168 counting only the distinct ones).

The product of its (nonzero) digits is 30233088, while the sum is 63.

The spelling of 90431296691328 in words is "ninety trillion, four hundred thirty-one billion, two hundred ninety-six million, six hundred ninety-one thousand, three hundred twenty-eight".