90090091620 has 96 divisors (see below), whose sum is σ = 286243776000. Its totient is φ = 23512868352.

The previous prime is 90090091603. The next prime is 90090091627. The reversal of 90090091620 is 2619009009.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (90090091627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1749445 + ... + 1800204.

It is an arithmetic number, because the mean of its divisors is an integer number (2981706000).

Almost surely, 2^90090091620 is an apocalyptic number.

90090091620 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

90090091620 is an abundant number, since it is smaller than the sum of its proper divisors (196153684380).

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

90090091620 is a wasteful number, since it uses less digits than its factorization.

90090091620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3549714 (or 3549706 counting only the distinct ones).

The product of its (nonzero) digits is 8748, while the sum is 36.

The spelling of 90090091620 in words is "ninety billion, ninety million, ninety-one thousand, six hundred twenty".