616685 has 8 divisors (see below), whose sum is σ = 765720. Its totient is φ = 476224.

The previous prime is 616673. The next prime is 616703. The reversal of 616685 is 586616.

It can be written as a sum of positive squares in 4 ways, for example, as 6724 + 609961 = 82^2 + 781^2 .

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 616685 - 2⁴ = 616669 is a prime.

It is a Curzon number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 616685.

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 7 ways as a sum of consecutive naturals, for example, 1982 + ... + 2271.

It is an arithmetic number, because the mean of its divisors is an integer number (95715).

2⁶¹⁶⁶⁸⁵ is an apocalyptic number.

It is an amenable number.

616685 is a deficient number, since it is larger than the sum of its proper divisors (149035).

616685 is a wasteful number, since it uses less digits than its factorization.

616685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4287.

The product of its digits is 8640, while the sum is 32.

The square root of 616685 is about 785.2929389725. The cubic root of 616685 is about 85.1179446859.

The spelling of 616685 in words is "six hundred sixteen thousand, six hundred eighty-five".