687573665 has 8 divisors (see below), whose sum is σ = 826054080. Its totient is φ = 549415152.

The previous prime is 687573643. The next prime is 687573697. The reversal of 687573665 is 566375786.

It is a happy number.

687573665 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 687573665 - 2¹⁴ = 687557281 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 75749 + ... + 84338.

It is an arithmetic number, because the mean of its divisors is an integer number (103256760).

Almost surely, 2^687573665 is an apocalyptic number.

It is an amenable number.

687573665 is a deficient number, since it is larger than the sum of its proper divisors (138480415).

687573665 is a wasteful number, since it uses less digits than its factorization.

687573665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160951.

The product of its digits is 6350400, while the sum is 53.

The square root of 687573665 is about 26221.6259030595. The cubic root of 687573665 is about 882.6186055069.

The spelling of 687573665 in words is "six hundred eighty-seven million, five hundred seventy-three thousand, six hundred sixty-five".