90090991000 has 64 divisors (see below), whose sum is σ = 217613410560. Its totient is φ = 34873920000.

The previous prime is 90090990959. The next prime is 90090991009. The reversal of 90090991000 is 19909009.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90090991009) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1422081 + ... + 1484080.

It is an arithmetic number, because the mean of its divisors is an integer number (3400209540).

Almost surely, 2^90090991000 is an apocalyptic number.

It is an amenable number.

90090991000 is an abundant number, since it is smaller than the sum of its proper divisors (127522419560).

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

90090991000 is a wasteful number, since it uses less digits than its factorization.

90090991000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2906213 (or 2906199 counting only the distinct ones).

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

The spelling of 90090991000 in words is "ninety billion, ninety million, nine hundred ninety-one thousand".