89991911790 has 256 divisors, whose sum is σ = 291786624000. Its totient is φ = 19452026880.

The previous prime is 89991911749. The next prime is 89991911797. The reversal of 89991911790 is 9711919998.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (89991911797) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 912406 + ... + 1006214.

It is an arithmetic number, because the mean of its divisors is an integer number (1139791500).

Almost surely, 2^89991911790 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 89991911790, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (145893312000).

89991911790 is an abundant number, since it is smaller than the sum of its proper divisors (201794712210).

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

89991911790 is a wasteful number, since it uses less digits than its factorization.

89991911790 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93872 (or 93866 counting only the distinct ones).

The product of its (nonzero) digits is 3306744, while the sum is 63.

The spelling of 89991911790 in words is "eighty-nine billion, nine hundred ninety-one million, nine hundred eleven thousand, seven hundred ninety".