997696688 has 40 divisors (see below), whose sum is σ = 2060582400. Its totient is φ = 466599744.

The previous prime is 997696673. The next prime is 997696703. The reversal of 997696688 is 886696799.

It is an interprime number because it is at equal distance from previous prime (997696673) and next prime (997696703).

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 7 ways as a sum of consecutive naturals, for example, 3245 + ... + 44787.

It is an arithmetic number, because the mean of its divisors is an integer number (51514560).

Almost surely, 2^997696688 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 997696688, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1030291200).

997696688 is an abundant number, since it is smaller than the sum of its proper divisors (1062885712).

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

997696688 is a wasteful number, since it uses less digits than its factorization.

With its predecessor (997696687) it forms a Ruth-Aaron pair, since the sum of their prime factors is the same (41649).

997696688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41649 (or 41643 counting only the distinct ones).

The product of its digits is 70543872, while the sum is 68.

The square root of 997696688 is about 31586.3370462610. The cubic root of 997696688 is about 999.2316391061.

The spelling of 997696688 in words is "nine hundred ninety-seven million, six hundred ninety-six thousand, six hundred eighty-eight".