688972694 has 8 divisors (see below), whose sum is σ = 1038012408. Its totient is φ = 342968560.

The previous prime is 688972693. The next prime is 688972721. The reversal of 688972694 is 496279886.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (688972693) 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 in 3 ways as a sum of consecutive naturals, for example, 758327 + ... + 759234.

It is an arithmetic number, because the mean of its divisors is an integer number (129751551).

Almost surely, 2^688972694 is an apocalyptic number.

688972694 is a deficient number, since it is larger than the sum of its proper divisors (349039714).

688972694 is a wasteful number, since it uses less digits than its factorization.

688972694 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1517790.

The product of its digits is 10450944, while the sum is 59.

The square root of 688972694 is about 26248.2893537846. The cubic root of 688972694 is about 883.2168310891.

The spelling of 688972694 in words is "six hundred eighty-eight million, nine hundred seventy-two thousand, six hundred ninety-four".