997128816 has 80 divisors (see below), whose sum is σ = 2733158400. Its totient is φ = 312367104.

The previous prime is 997128791. The next prime is 997128833. The reversal of 997128816 is 618821799.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 111520 + ... + 120128.

It is an arithmetic number, because the mean of its divisors is an integer number (34164480).

Almost surely, 2^997128816 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 997128816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1366579200).

997128816 is an abundant number, since it is smaller than the sum of its proper divisors (1736029584).

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

997128816 is a wasteful number, since it uses less digits than its factorization.

997128816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8766 (or 8760 counting only the distinct ones).

The product of its digits is 435456, while the sum is 51.

The square root of 997128816 is about 31577.3465636364. The cubic root of 997128816 is about 999.0420212364.

The spelling of 997128816 in words is "nine hundred ninety-seven million, one hundred twenty-eight thousand, eight hundred sixteen".