990931968 has 220 divisors, whose sum is σ = 3190208560. Its totient is φ = 304570368.

The previous prime is 990931967. The next prime is 990931979. The reversal of 990931968 is 869139099.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (990931961) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1077813 + ... + 1078731.

It is an arithmetic number, because the mean of its divisors is an integer number (14500948).

Almost surely, 2^990931968 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 990931968, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1595104280).

990931968 is an abundant number, since it is smaller than the sum of its proper divisors (2199276592).

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

990931968 is a wasteful number, since it uses less digits than its factorization.

990931968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 964 (or 937 counting only the distinct ones).

The product of its (nonzero) digits is 944784, while the sum is 54.

The square root of 990931968 is about 31479.0719049975. The cubic root of 990931968 is about 996.9681397801.

The spelling of 990931968 in words is "nine hundred ninety million, nine hundred thirty-one thousand, nine hundred sixty-eight".