687579 has 8 divisors (see below), whose sum is σ = 920640. Its totient is φ = 456456.

The previous prime is 687559. The next prime is 687581. The reversal of 687579 is 975786.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 687579 - 2¹² = 683483 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 687579.

It is not an unprimeable number, because it can be changed into a prime (687559) 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, 984 + ... + 1530.

It is an arithmetic number, because the mean of its divisors is an integer number (115080).

2⁶⁸⁷⁵⁷⁹ is an apocalyptic number.

687579 is a deficient number, since it is larger than the sum of its proper divisors (233061).

687579 is a wasteful number, since it uses less digits than its factorization.

687579 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 969.

The product of its digits is 105840, while the sum is 42.

The square root of 687579 is about 829.2038350128. The cubic root of 687579 is about 88.2620888297.

The spelling of 687579 in words is "six hundred eighty-seven thousand, five hundred seventy-nine".