997968688 has 10 divisors (see below), whose sum is σ = 1933564364. Its totient is φ = 498984336.

The previous prime is 997968661. The next prime is 997968701. The reversal of 997968688 is 886869799.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31186506 + ... + 31186537.

Almost surely, 2^997968688 is an apocalyptic number.

It is an amenable number.

997968688 is a deficient number, since it is larger than the sum of its proper divisors (935595676).

997968688 is a wasteful number, since it uses less digits than its factorization.

997968688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62373051 (or 62373045 counting only the distinct ones).

The product of its digits is 94058496, while the sum is 70.

The square root of 997968688 is about 31590.6424119548. The cubic root of 997968688 is about 999.3224370121.

The spelling of 997968688 in words is "nine hundred ninety-seven million, nine hundred sixty-eight thousand, six hundred eighty-eight".