688746734 has 16 divisors (see below), whose sum is σ = 1129199568. Its totient is φ = 313137792.

The previous prime is 688746697. The next prime is 688746739. The reversal of 688746734 is 437647886.

688746734 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Smith number, since the sum of its digits (53) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (688746739) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 195947 + ... + 199430.

It is an arithmetic number, because the mean of its divisors is an integer number (70574973).

Almost surely, 2^688746734 is an apocalyptic number.

688746734 is a deficient number, since it is larger than the sum of its proper divisors (440452834).

688746734 is a wasteful number, since it uses less digits than its factorization.

688746734 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 395459.

The product of its digits is 5419008, while the sum is 53.

The square root of 688746734 is about 26243.9847203126. The cubic root of 688746734 is about 883.1202653382.

The spelling of 688746734 in words is "six hundred eighty-eight million, seven hundred forty-six thousand, seven hundred thirty-four".