685642859 has 8 divisors (see below), whose sum is σ = 748270128. Its totient is φ = 623064960.

The previous prime is 685642849. The next prime is 685642883. The reversal of 685642859 is 958246586.

685642859 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 a de Polignac number, because none of the positive numbers 2^k-685642859 is a prime.

It is a super-2 number, since 2×685642859² = 940212260195387762, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 685642859.

It is not an unprimeable number, because it can be changed into a prime (685642849) 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, 20519 + ... + 42335.

It is an arithmetic number, because the mean of its divisors is an integer number (93533766).

Almost surely, 2^685642859 is an apocalyptic number.

685642859 is a deficient number, since it is larger than the sum of its proper divisors (62627269).

685642859 is a wasteful number, since it uses less digits than its factorization.

685642859 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24685.

The product of its digits is 4147200, while the sum is 53.

The square root of 685642859 is about 26184.7829664483. The cubic root of 685642859 is about 881.7916575206.

The spelling of 685642859 in words is "six hundred eighty-five million, six hundred forty-two thousand, eight hundred fifty-nine".