685634 has 8 divisors (see below), whose sum is σ = 1082640. Its totient is φ = 324756.

The previous prime is 685631. The next prime is 685637. The reversal of 685634 is 436586.

It is an interprime number because it is at equal distance from previous prime (685631) and next prime (685637).

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

It is a nialpdrome in base 16.

It is a self number, because there is not a number n which added to its sum of digits gives 685634.

It is not an unprimeable number, because it can be changed into a prime (685631) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8984 + ... + 9059.

It is an arithmetic number, because the mean of its divisors is an integer number (135330).

2⁶⁸⁵⁶³⁴ is an apocalyptic number.

685634 is a deficient number, since it is larger than the sum of its proper divisors (397006).

685634 is a wasteful number, since it uses less digits than its factorization.

685634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18064.

The product of its digits is 17280, while the sum is 32.

The square root of 685634 is about 828.0301926862. The cubic root of 685634 is about 88.1787859710.

The spelling of 685634 in words is "six hundred eighty-five thousand, six hundred thirty-four".