990611788790 has 32 divisors (see below), whose sum is σ = 1961119520640. Its totient is φ = 357982130304.

The previous prime is 990611788769. The next prime is 990611788801. The reversal of 990611788790 is 97887116099.

990611788790 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Smith number, since the sum of its digits (65) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Harshad number since it is a multiple of its sum of digits (65).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 81058685 + ... + 81070904.

It is an arithmetic number, because the mean of its divisors is an integer number (61284985020).

Almost surely, 2^990611788790 is an apocalyptic number.

990611788790 is a deficient number, since it is larger than the sum of its proper divisors (970507731850).

990611788790 is a wasteful number, since it uses less digits than its factorization.

990611788790 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162129656.

The product of its (nonzero) digits is 13716864, while the sum is 65.

The spelling of 990611788790 in words is "nine hundred ninety billion, six hundred eleven million, seven hundred eighty-eight thousand, seven hundred ninety".