685473844 has 12 divisors (see below), whose sum is σ = 1308631968. Its totient is φ = 311579000.

The previous prime is 685473823. The next prime is 685473871. The reversal of 685473844 is 448374586.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7789432 + ... + 7789519.

It is an arithmetic number, because the mean of its divisors is an integer number (109052664).

Almost surely, 2^685473844 is an apocalyptic number.

It is an amenable number.

685473844 is a deficient number, since it is larger than the sum of its proper divisors (623158124).

685473844 is a wasteful number, since it uses less digits than its factorization.

685473844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15578966 (or 15578964 counting only the distinct ones).

The product of its digits is 2580480, while the sum is 49.

The square root of 685473844 is about 26181.5554159794. Note that the first 3 decimals coincide. The cubic root of 685473844 is about 881.7191959551.

The spelling of 685473844 in words is "six hundred eighty-five million, four hundred seventy-three thousand, eight hundred forty-four".