685654 has 8 divisors (see below), whose sum is σ = 1036728. Its totient is φ = 340080.

The previous prime is 685649. The next prime is 685669. The reversal of 685654 is 456586.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1047 + ... + 1570.

It is an arithmetic number, because the mean of its divisors is an integer number (129591).

2⁶⁸⁵⁶⁵⁴ is an apocalyptic number.

685654 is the 524-th heptagonal number.

685654 is a deficient number, since it is larger than the sum of its proper divisors (351074).

685654 is a wasteful number, since it uses less digits than its factorization.

685654 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2750.

The product of its digits is 28800, while the sum is 34.

The square root of 685654 is about 828.0422694525. The cubic root of 685654 is about 88.1796433568.

The spelling of 685654 in words is "six hundred eighty-five thousand, six hundred fifty-four".