687718973 has 8 divisors (see below), whose sum is σ = 713038080. Its totient is φ = 662595840.

The previous prime is 687718961. The next prime is 687718987. The reversal of 687718973 is 379817786.

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 687718973 - 2⁴ = 687718957 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (687718903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41828 + ... + 55901.

It is an arithmetic number, because the mean of its divisors is an integer number (89129760).

Almost surely, 2^687718973 is an apocalyptic number.

It is an amenable number.

687718973 is a deficient number, since it is larger than the sum of its proper divisors (25319107).

687718973 is a wasteful number, since it uses less digits than its factorization.

687718973 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97987.

The product of its digits is 3556224, while the sum is 56.

The square root of 687718973 is about 26224.3965230851. The cubic root of 687718973 is about 882.6807770323.

The spelling of 687718973 in words is "six hundred eighty-seven million, seven hundred eighteen thousand, nine hundred seventy-three".