997892128 has 24 divisors (see below), whose sum is σ = 1965919788. Its totient is φ = 498610944.

The previous prime is 997892123. The next prime is 997892131. The reversal of 997892128 is 821298799.

It can be written as a sum of positive squares in 2 ways, for example, as 891141904 + 106750224 = 29852^2 + 10332^2 .

It is not an unprimeable number, because it can be changed into a prime (997892123) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 41950 + ... + 61282.

Almost surely, 2^997892128 is an apocalyptic number.

It is an amenable number.

997892128 is a deficient number, since it is larger than the sum of its proper divisors (968027660).

997892128 is a wasteful number, since it uses less digits than its factorization.

997892128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20956 (or 20948 counting only the distinct ones).

The product of its digits is 1306368, while the sum is 55.

The square root of 997892128 is about 31589.4306374775. The cubic root of 997892128 is about 999.2968817406.

The spelling of 997892128 in words is "nine hundred ninety-seven million, eight hundred ninety-two thousand, one hundred twenty-eight".