997178688 has 392 divisors, whose sum is σ = 3398093280. Its totient is φ = 287400960.

The previous prime is 997178687. The next prime is 997178723. The reversal of 997178688 is 886871799.

Its product of digits (12192768) is a multiple of the sum of its prime divisors (112).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (997178687) by changing a digit.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 14883231 + ... + 14883297.

Almost surely, 2^997178688 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 997178688, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1699046640).

997178688 is an abundant number, since it is smaller than the sum of its proper divisors (2400914592).

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

997178688 is a wasteful number, since it uses less digits than its factorization.

997178688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137 (or 112 counting only the distinct ones).

The product of its digits is 12192768, while the sum is 63.

The square root of 997178688 is about 31578.1362337932. The cubic root of 997178688 is about 999.0586768554.

The spelling of 997178688 in words is "nine hundred ninety-seven million, one hundred seventy-eight thousand, six hundred eighty-eight".