990597988 has 12 divisors (see below), whose sum is σ = 1733946732. Its totient is φ = 495184640.

The previous prime is 990597983. The next prime is 990597997. The reversal of 990597988 is 889795099.

990597988 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 847508544 + 143089444 = 29112^2 + 11962^2 .

It is not an unprimeable number, because it can be changed into a prime (990597983) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7345 + ... + 45112.

It is an arithmetic number, because the mean of its divisors is an integer number (144495561).

Almost surely, 2^990597988 is an apocalyptic number.

It is an amenable number.

990597988 is a deficient number, since it is larger than the sum of its proper divisors (743348744).

990597988 is a wasteful number, since it uses less digits than its factorization.

990597988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57182 (or 57180 counting only the distinct ones).

The product of its (nonzero) digits is 14696640, while the sum is 64.

The square root of 990597988 is about 31473.7666636836. The cubic root of 990597988 is about 996.8561223916.

The spelling of 990597988 in words is "nine hundred ninety million, five hundred ninety-seven thousand, nine hundred eighty-eight".