685641228 has 48 divisors (see below), whose sum is σ = 1646216544. Its totient is φ = 221944320.

The previous prime is 685641223. The next prime is 685641323. The reversal of 685641228 is 822146586.

It is a self number, because there is not a number n which added to its sum of digits gives 685641228.

It is not an unprimeable number, because it can be changed into a prime (685641223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 299448 + ... + 301728.

It is an arithmetic number, because the mean of its divisors is an integer number (34296178).

Almost surely, 2^685641228 is an apocalyptic number.

It is an amenable number.

685641228 is an abundant number, since it is smaller than the sum of its proper divisors (960575316).

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

685641228 is a wasteful number, since it uses less digits than its factorization.

685641228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3002 (or 3000 counting only the distinct ones).

The product of its digits is 184320, while the sum is 42.

The square root of 685641228 is about 26184.7518223870. The cubic root of 685641228 is about 881.7909583212.

It can be divided in two parts, 6856 and 41228, that added together give a palindrome (48084).

The spelling of 685641228 in words is "six hundred eighty-five million, six hundred forty-one thousand, two hundred twenty-eight".