90909091000 has 256 divisors, whose sum is σ = 275603328000. Its totient is φ = 27256435200.

The previous prime is 90909090977. The next prime is 90909091027. The reversal of 90909091000 is 19090909.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1702711 + ... + 1755289.

It is an arithmetic number, because the mean of its divisors is an integer number (1076575500).

Almost surely, 2^90909091000 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 90909091000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (137801664000).

90909091000 is an abundant number, since it is smaller than the sum of its proper divisors (184694237000).

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

90909091000 is a wasteful number, since it uses less digits than its factorization.

90909091000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52639 (or 52625 counting only the distinct ones).

The product of its (nonzero) digits is 6561, while the sum is 37.

It can be divided in two parts, 9090909 and 1000, that added together give a palindrome (9091909).

The spelling of 90909091000 in words is "ninety billion, nine hundred nine million, ninety-one thousand".