688442926 has 4 divisors (see below), whose sum is σ = 1032664392. Its totient is φ = 344221462.

The previous prime is 688442921. The next prime is 688442927. The reversal of 688442926 is 629244886.

It is a semiprime because it is the product of two primes.

It is a self number, because there is not a number n which added to its sum of digits gives 688442926.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (688442921) by changing a digit.

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 as a sum of consecutive naturals, namely, 172110730 + ... + 172110733.

It is an arithmetic number, because the mean of its divisors is an integer number (258166098).

Almost surely, 2^688442926 is an apocalyptic number.

688442926 is a deficient number, since it is larger than the sum of its proper divisors (344221466).

688442926 is a wasteful number, since it uses less digits than its factorization.

688442926 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 344221465.

The product of its digits is 1327104, while the sum is 49.

The square root of 688442926 is about 26238.1959364587. The cubic root of 688442926 is about 882.9903973489.

The spelling of 688442926 in words is "six hundred eighty-eight million, four hundred forty-two thousand, nine hundred twenty-six".