688137764 has 24 divisors (see below), whose sum is σ = 1276126488. Its totient is φ = 323563520.

The previous prime is 688137757. The next prime is 688137817. The reversal of 688137764 is 467731886.

It can be written as a sum of positive squares in 4 ways, for example, as 57123364 + 631014400 = 7558^2 + 25120^2 .

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, 97292 + ... + 104124.

It is an arithmetic number, because the mean of its divisors is an integer number (53171937).

Almost surely, 2^688137764 is an apocalyptic number.

It is an amenable number.

688137764 is a deficient number, since it is larger than the sum of its proper divisors (587988724).

688137764 is a wasteful number, since it uses less digits than its factorization.

688137764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8335 (or 8333 counting only the distinct ones).

The product of its digits is 1354752, while the sum is 50.

The square root of 688137764 is about 26232.3800673900. The cubic root of 688137764 is about 882.8599121005.

The spelling of 688137764 in words is "six hundred eighty-eight million, one hundred thirty-seven thousand, seven hundred sixty-four".