90909111820 has 24 divisors (see below), whose sum is σ = 190914814944. Its totient is φ = 36362562816.

The previous prime is 90909111791. The next prime is 90909111857. The reversal of 90909111820 is 2811190909.

It is a super-2 number, since 2×90909111820² (a number of 23 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, 1212052 + ... + 1284868.

It is an arithmetic number, because the mean of its divisors is an integer number (7954783956).

Almost surely, 2^90909111820 is an apocalyptic number.

It is an amenable number.

90909111820 is an abundant number, since it is smaller than the sum of its proper divisors (100005703124).

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

90909111820 is a wasteful number, since it uses less digits than its factorization.

90909111820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135249 (or 135247 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 40.

The spelling of 90909111820 in words is "ninety billion, nine hundred nine million, one hundred eleven thousand, eight hundred twenty".