687475321 has 16 divisors (see below), whose sum is σ = 757911168. Its totient is φ = 619718400.

The previous prime is 687475319. The next prime is 687475333. The reversal of 687475321 is 123574786.

687475321 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 687475321 - 2¹ = 687475319 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (687475351) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 95281 + ... + 102241.

It is an arithmetic number, because the mean of its divisors is an integer number (47369448).

Almost surely, 2^687475321 is an apocalyptic number.

It is an amenable number.

687475321 is a deficient number, since it is larger than the sum of its proper divisors (70435847).

687475321 is a wasteful number, since it uses less digits than its factorization.

687475321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7152.

The product of its digits is 282240, while the sum is 43.

The square root of 687475321 is about 26219.7505899656. The cubic root of 687475321 is about 882.5765230425.

The spelling of 687475321 in words is "six hundred eighty-seven million, four hundred seventy-five thousand, three hundred twenty-one".