688700328 has 32 divisors (see below), whose sum is σ = 1823031360. Its totient is φ = 216062720.

The previous prime is 688700317. The next prime is 688700359. The reversal of 688700328 is 823007886.

It is a self number, because there is not a number n which added to its sum of digits gives 688700328.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 843588 + ... + 844403.

It is an arithmetic number, because the mean of its divisors is an integer number (56969730).

Almost surely, 2^688700328 is an apocalyptic number.

688700328 is a gapful number since it is divisible by the number (68) formed by its first and last digit.

It is an amenable number.

688700328 is an abundant number, since it is smaller than the sum of its proper divisors (1134331032).

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

688700328 is a wasteful number, since it uses less digits than its factorization.

688700328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1688017 (or 1688013 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 42.

The square root of 688700328 is about 26243.1005790093. The cubic root of 688700328 is about 883.1004307616.

The spelling of 688700328 in words is "six hundred eighty-eight million, seven hundred thousand, three hundred twenty-eight".