685504979 has 8 divisors (see below), whose sum is σ = 693800448. Its totient is φ = 677255040.

The previous prime is 685504969. The next prime is 685505003. The reversal of 685504979 is 979405586.

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-685504979 is a prime.

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 685504979.

It is not an unprimeable number, because it can be changed into a prime (685504969) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19409 + ... + 41805.

It is an arithmetic number, because the mean of its divisors is an integer number (86725056).

Almost surely, 2^685504979 is an apocalyptic number.

685504979 is a deficient number, since it is larger than the sum of its proper divisors (8295469).

685504979 is a wasteful number, since it uses less digits than its factorization.

685504979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22765.

The product of its (nonzero) digits is 2721600, while the sum is 53.

The square root of 685504979 is about 26182.1500072091. The cubic root of 685504979 is about 881.7325453152.

The spelling of 685504979 in words is "six hundred eighty-five million, five hundred four thousand, nine hundred seventy-nine".