688690923 has 16 divisors (see below), whose sum is σ = 943211136. Its totient is φ = 446814720.

The previous prime is 688690913. The next prime is 688690943. The reversal of 688690923 is 329096886.

688690923 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 688690923 - 2⁴ = 688690907 is a prime.

It is not an unprimeable number, because it can be changed into a prime (688690913) 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, 3958 + ... + 37323.

It is an arithmetic number, because the mean of its divisors is an integer number (58950696).

Almost surely, 2^688690923 is an apocalyptic number.

688690923 is a deficient number, since it is larger than the sum of its proper divisors (254520213).

688690923 is a wasteful number, since it uses less digits than its factorization.

688690923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41434.

The product of its (nonzero) digits is 1119744, while the sum is 51.

The square root of 688690923 is about 26242.9213884430. The cubic root of 688690923 is about 883.0964108239.

The spelling of 688690923 in words is "six hundred eighty-eight million, six hundred ninety thousand, nine hundred twenty-three".