688512673 has 8 divisors (see below), whose sum is σ = 702055016. Its totient is φ = 675043200.

The previous prime is 688512661. The next prime is 688512679. The reversal of 688512673 is 376215886.

It can be written as a sum of positive squares in 4 ways, for example, as 98168464 + 590344209 = 9908^2 + 24297^2 .

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 688512673 - 2⁵ = 688512641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (688512679) 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, 1063 + ... + 37123.

It is an arithmetic number, because the mean of its divisors is an integer number (87756877).

Almost surely, 2^688512673 is an apocalyptic number.

It is an amenable number.

688512673 is a deficient number, since it is larger than the sum of its proper divisors (13542343).

688512673 is a wasteful number, since it uses less digits than its factorization.

688512673 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36435.

The product of its digits is 483840, while the sum is 46.

The square root of 688512673 is about 26239.5250147559. The cubic root of 688512673 is about 883.0202152899.

The spelling of 688512673 in words is "six hundred eighty-eight million, five hundred twelve thousand, six hundred seventy-three".