990322920 has 96 divisors (see below), whose sum is σ = 3225830400. Its totient is φ = 263488896.

The previous prime is 990322909. The next prime is 990322973. The reversal of 990322920 is 29223099.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 169569 + ... + 175311.

It is an arithmetic number, because the mean of its divisors is an integer number (33602400).

Almost surely, 2^990322920 is an apocalyptic number.

990322920 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 990322920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1612915200).

990322920 is an abundant number, since it is smaller than the sum of its proper divisors (2235507480).

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

990322920 is a wasteful number, since it uses less digits than its factorization.

990322920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6239 (or 6232 counting only the distinct ones).

The product of its (nonzero) digits is 17496, while the sum is 36.

The square root of 990322920 is about 31469.3965623747. The cubic root of 990322920 is about 996.7638452663.

It can be divided in two parts, 9903 and 22920, that added together give a palindrome (32823).

The spelling of 990322920 in words is "nine hundred ninety million, three hundred twenty-two thousand, nine hundred twenty".