688312197 has 12 divisors (see below), whose sum is σ = 994957600. Its totient is φ = 458538408.

The previous prime is 688312181. The next prime is 688312199. The reversal of 688312197 is 791213886.

It is not a de Polignac number, because 688312197 - 2⁴ = 688312181 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (688312199) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14743 + ... + 39924.

Almost surely, 2^688312197 is an apocalyptic number.

It is an amenable number.

688312197 is a deficient number, since it is larger than the sum of its proper divisors (306645403).

688312197 is a wasteful number, since it uses less digits than its factorization.

688312197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56072 (or 56069 counting only the distinct ones).

The product of its digits is 145152, while the sum is 45.

The square root of 688312197 is about 26235.7046217554. The cubic root of 688312197 is about 882.9345032171.

The spelling of 688312197 in words is "six hundred eighty-eight million, three hundred twelve thousand, one hundred ninety-seven".