688137996 has 48 divisors (see below), whose sum is σ = 1976194304. Its totient is φ = 181486656.

The previous prime is 688137979. The next prime is 688137997. The reversal of 688137996 is 699731886.

It is not an unprimeable number, because it can be changed into a prime (688137997) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 313990 + ... + 316173.

Almost surely, 2^688137996 is an apocalyptic number.

It is an amenable number.

688137996 is an abundant number, since it is smaller than the sum of its proper divisors (1288056308).

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

688137996 is a wasteful number, since it uses less digits than its factorization.

688137996 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 630190 (or 630188 counting only the distinct ones).

The product of its digits is 3919104, while the sum is 57.

The square root of 688137996 is about 26232.3844894055. The cubic root of 688137996 is about 882.8600113168.

The spelling of 688137996 in words is "six hundred eighty-eight million, one hundred thirty-seven thousand, nine hundred ninety-six".