685722250 has 16 divisors (see below), whose sum is σ = 1283672520. Its totient is φ = 274288800.

The previous prime is 685722239. The next prime is 685722269. The reversal of 685722250 is 52227586.

685722250 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 4 ways, for example, as 386397649 + 299324601 = 19657^2 + 17301^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1371195 + ... + 1371694.

Almost surely, 2^685722250 is an apocalyptic number.

685722250 is a deficient number, since it is larger than the sum of its proper divisors (597950270).

685722250 is a wasteful number, since it uses less digits than its factorization.

685722250 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2742906 (or 2742896 counting only the distinct ones).

The product of its (nonzero) digits is 67200, while the sum is 37.

The square root of 685722250 is about 26186.2988984698. The cubic root of 685722250 is about 881.8256906030.

The spelling of 685722250 in words is "six hundred eighty-five million, seven hundred twenty-two thousand, two hundred fifty".