996989856 has 72 divisors (see below), whose sum is σ = 2661658272. Its totient is φ = 326764800.

The previous prime is 996989813. The next prime is 996989867. The reversal of 996989856 is 658989699.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 355821 + ... + 358611.

It is an arithmetic number, because the mean of its divisors is an integer number (36967476).

Almost surely, 2^996989856 is an apocalyptic number.

996989856 is a gapful number since it is divisible by the number (96) 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 996989856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1330829136).

996989856 is an abundant number, since it is smaller than the sum of its proper divisors (1664668416).

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

996989856 is a wasteful number, since it uses less digits than its factorization.

996989856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2926 (or 2857 counting only the distinct ones).

The product of its digits is 75582720, while the sum is 69.

The square root of 996989856 is about 31575.1461754336. The cubic root of 996989856 is about 998.9956102055.

The spelling of 996989856 in words is "nine hundred ninety-six million, nine hundred eighty-nine thousand, eight hundred fifty-six".