688319020 has 24 divisors (see below), whose sum is σ = 1446195744. Its totient is φ = 275189376.

The previous prime is 688318991. The next prime is 688319033. The reversal of 688319020 is 20913886.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38449 + ... + 53431.

It is an arithmetic number, because the mean of its divisors is an integer number (60258156).

Almost surely, 2^688319020 is an apocalyptic number.

It is an amenable number.

688319020 is an abundant number, since it is smaller than the sum of its proper divisors (757876724).

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

688319020 is a wasteful number, since it uses less digits than its factorization.

688319020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17289 (or 17287 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 37.

The square root of 688319020 is about 26235.8346541519. The cubic root of 688319020 is about 882.9374206153.

The spelling of 688319020 in words is "six hundred eighty-eight million, three hundred nineteen thousand, twenty".