90819081918 has 24 divisors (see below), whose sum is σ = 196812158400. Its totient is φ = 30267261024.

The previous prime is 90819081917. The next prime is 90819081961. The reversal of 90819081918 is 81918091809.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90819081917) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 382863 + ... + 572906.

It is an arithmetic number, because the mean of its divisors is an integer number (8200506600).

Almost surely, 2^90819081918 is an apocalyptic number.

90819081918 is an abundant number, since it is smaller than the sum of its proper divisors (105993076482).

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

90819081918 is a wasteful number, since it uses less digits than its factorization.

90819081918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 961056 (or 961053 counting only the distinct ones).

The product of its (nonzero) digits is 373248, while the sum is 54.

The spelling of 90819081918 in words is "ninety billion, eight hundred nineteen million, eighty-one thousand, nine hundred eighteen".