687325809 has 8 divisors (see below), whose sum is σ = 920472480. Its totient is φ = 456198176.

The previous prime is 687325799. The next prime is 687325819. The reversal of 687325809 is 908523786.

It is an interprime number because it is at equal distance from previous prime (687325799) and next prime (687325819).

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 687325809 - 2⁹ = 687325297 is a prime.

It is not an unprimeable number, because it can be changed into a prime (687325819) 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, 503964 + ... + 505325.

It is an arithmetic number, because the mean of its divisors is an integer number (115059060).

Almost surely, 2^687325809 is an apocalyptic number.

It is an amenable number.

687325809 is a deficient number, since it is larger than the sum of its proper divisors (233146671).

687325809 is a wasteful number, since it uses less digits than its factorization.

687325809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1009519.

The product of its (nonzero) digits is 725760, while the sum is 48.

The square root of 687325809 is about 26216.8993017862. The cubic root of 687325809 is about 882.5125375465.

The spelling of 687325809 in words is "six hundred eighty-seven million, three hundred twenty-five thousand, eight hundred nine".