685400224 has 24 divisors (see below), whose sum is σ = 1420403040. Its totient is φ = 324662976.

The previous prime is 685400189. The next prime is 685400249. The reversal of 685400224 is 422004586.

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 3 ways as a sum of consecutive naturals, for example, 563044 + ... + 564259.

It is an arithmetic number, because the mean of its divisors is an integer number (59183460).

Almost surely, 2^685400224 is an apocalyptic number.

It is an amenable number.

685400224 is an abundant number, since it is smaller than the sum of its proper divisors (735002816).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

685400224 is a wasteful number, since it uses less digits than its factorization.

685400224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1127332 (or 1127324 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 31.

The square root of 685400224 is about 26180.1494266171. The cubic root of 685400224 is about 881.6876292310.

The spelling of 685400224 in words is "six hundred eighty-five million, four hundred thousand, two hundred twenty-four".