9091889197920 has 384 divisors, whose sum is σ = 32898735636480. Its totient is φ = 2342678353920.

The previous prime is 9091889197907. The next prime is 9091889197921. The reversal of 9091889197920 is 297919881909.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9091889197921) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 87397777 + ... + 87501743.

It is an arithmetic number, because the mean of its divisors is an integer number (85673790720).

Almost surely, 2^{9091889197920} is an apocalyptic number.

9091889197920 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 9091889197920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16449367818240).

9091889197920 is an abundant number, since it is smaller than the sum of its proper divisors (23806846438560).

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

9091889197920 is a wasteful number, since it uses less digits than its factorization.

9091889197920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104675 (or 104661 counting only the distinct ones).

The product of its (nonzero) digits is 52907904, while the sum is 72.

The spelling of 9091889197920 in words is "nine trillion, ninety-one billion, eight hundred eighty-nine million, one hundred ninety-seven thousand, nine hundred twenty".