685457228 has 12 divisors (see below), whose sum is σ = 1202336352. Its totient is φ = 341932560.

The previous prime is 685457203. The next prime is 685457231. The reversal of 685457228 is 822754586.

It is a super-2 number, since 2×685457228² = 939703222834887968, which contains 22 as substring.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 197075 + ... + 200522.

It is an arithmetic number, because the mean of its divisors is an integer number (100194696).

Almost surely, 2^685457228 is an apocalyptic number.

It is an amenable number.

685457228 is a deficient number, since it is larger than the sum of its proper divisors (516879124).

685457228 is a wasteful number, since it uses less digits than its factorization.

685457228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 398032 (or 398030 counting only the distinct ones).

The product of its digits is 1075200, while the sum is 47.

The square root of 685457228 is about 26181.2380914272. The cubic root of 685457228 is about 881.7120715576.

The spelling of 685457228 in words is "six hundred eighty-five million, four hundred fifty-seven thousand, two hundred twenty-eight".