685175444 has 6 divisors (see below), whose sum is σ = 1199057034. Its totient is φ = 342587720.

The previous prime is 685175401. The next prime is 685175461. The reversal of 685175444 is 444571586.

685175444 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 642115600 + 43059844 = 25340^2 + 6562^2 .

It is a junction number, because it is equal to n+sod(n) for n = 685175395 and 685175404.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85646927 + ... + 85646934.

It is an arithmetic number, because the mean of its divisors is an integer number (199842839).

Almost surely, 2^685175444 is an apocalyptic number.

It is an amenable number.

685175444 is a deficient number, since it is larger than the sum of its proper divisors (513881590).

685175444 is a wasteful number, since it uses less digits than its factorization.

685175444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171293865 (or 171293863 counting only the distinct ones).

The product of its digits is 537600, while the sum is 44.

The square root of 685175444 is about 26175.8561273552. The cubic root of 685175444 is about 881.5912342550.

The spelling of 685175444 in words is "six hundred eighty-five million, one hundred seventy-five thousand, four hundred forty-four".