688989673 has 8 divisors (see below), whose sum is σ = 698957640. Its totient is φ = 679071360.

The previous prime is 688989671. The next prime is 688989683. The reversal of 688989673 is 376989886.

It can be written as a sum of positive squares in 4 ways, for example, as 122168809 + 566820864 = 11053^2 + 23808^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 688989673 - 2¹ = 688989671 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (688989671) 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 7 ways as a sum of consecutive naturals, for example, 16003 + ... + 40423.

It is an arithmetic number, because the mean of its divisors is an integer number (87369705).

Almost surely, 2^688989673 is an apocalyptic number.

It is an amenable number.

688989673 is a deficient number, since it is larger than the sum of its proper divisors (9967967).

688989673 is a wasteful number, since it uses less digits than its factorization.

688989673 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24827.

The product of its digits is 31352832, while the sum is 64.

The square root of 688989673 is about 26248.6127823929. The cubic root of 688989673 is about 883.2240863430.

The spelling of 688989673 in words is "six hundred eighty-eight million, nine hundred eighty-nine thousand, six hundred seventy-three".