688137746 has 16 divisors (see below), whose sum is σ = 1041226368. Its totient is φ = 341074800.

The previous prime is 688137731. The next prime is 688137757. The reversal of 688137746 is 647731886.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 688137694 and 688137703.

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, 116951 + ... + 122693.

It is an arithmetic number, because the mean of its divisors is an integer number (65076648).

Almost surely, 2^688137746 is an apocalyptic number.

688137746 is a deficient number, since it is larger than the sum of its proper divisors (353088622).

688137746 is a wasteful number, since it uses less digits than its factorization.

688137746 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6257.

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

The square root of 688137746 is about 26232.3797243026. The cubic root of 688137746 is about 882.8599044027.

The spelling of 688137746 in words is "six hundred eighty-eight million, one hundred thirty-seven thousand, seven hundred forty-six".