90685280816 has 20 divisors (see below), whose sum is σ = 189218326752. Its totient is φ = 41854744896.

The previous prime is 90685280779. The next prime is 90685280897. The reversal of 90685280816 is 61808258609.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 217993256 + ... + 217993671.

Almost surely, 2^90685280816 is an apocalyptic number.

It is an amenable number.

90685280816 is an abundant number, since it is smaller than the sum of its proper divisors (98533045936).

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

90685280816 is a wasteful number, since it uses less digits than its factorization.

90685280816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 435986948 (or 435986942 counting only the distinct ones).

The product of its (nonzero) digits is 1658880, while the sum is 53.

The spelling of 90685280816 in words is "ninety billion, six hundred eighty-five million, two hundred eighty thousand, eight hundred sixteen".