685619605 has 16 divisors (see below), whose sum is σ = 950336064. Its totient is φ = 469300480.

The previous prime is 685619573. The next prime is 685619609. The reversal of 685619605 is 506916586.

It is not a de Polignac number, because 685619605 - 2⁵ = 685619573 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685619609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 365707 + ... + 367576.

It is an arithmetic number, because the mean of its divisors is an integer number (59396004).

Almost surely, 2^685619605 is an apocalyptic number.

It is an amenable number.

685619605 is a deficient number, since it is larger than the sum of its proper divisors (264716459).

685619605 is a wasteful number, since it uses less digits than its factorization.

685619605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 733316.

The product of its (nonzero) digits is 388800, while the sum is 46.

The square root of 685619605 is about 26184.3389261597. The cubic root of 685619605 is about 881.7816885721.

The spelling of 685619605 in words is "six hundred eighty-five million, six hundred nineteen thousand, six hundred five".