997963428 has 96 divisors (see below), whose sum is σ = 3003356160. Its totient is φ = 250266240.

The previous prime is 997963339. The next prime is 997963453. The reversal of 997963428 is 824369799.

It is a super-2 number, since 2×997963428² = 1991862007251022368, which contains 22 as substring.

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 31 ways as a sum of consecutive naturals, for example, 8175 + ... + 45417.

It is an arithmetic number, because the mean of its divisors is an integer number (31284960).

Almost surely, 2^997963428 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 997963428, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1501678080).

997963428 is an abundant number, since it is smaller than the sum of its proper divisors (2005392732).

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

997963428 is a wasteful number, since it uses less digits than its factorization.

997963428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37297 (or 37295 counting only the distinct ones).

The product of its digits is 5878656, while the sum is 57.

The square root of 997963428 is about 31590.5591593438. The cubic root of 997963428 is about 999.3206812973.

The spelling of 997963428 in words is "nine hundred ninety-seven million, nine hundred sixty-three thousand, four hundred twenty-eight".