685256172 has 24 divisors (see below), whose sum is σ = 1602585600. Its totient is φ = 227896656.

The previous prime is 685256107. The next prime is 685256177. The reversal of 685256172 is 271652586.

685256172 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (685256177) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 59772 + ... + 70307.

It is an arithmetic number, because the mean of its divisors is an integer number (66774400).

Almost surely, 2^685256172 is an apocalyptic number.

It is an amenable number.

685256172 is an abundant number, since it is smaller than the sum of its proper divisors (917329428).

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

685256172 is a wasteful number, since it uses less digits than its factorization.

685256172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130525 (or 130523 counting only the distinct ones).

The product of its digits is 201600, while the sum is 42.

The square root of 685256172 is about 26177.3981136399. The cubic root of 685256172 is about 881.6258561915.

The spelling of 685256172 in words is "six hundred eighty-five million, two hundred fifty-six thousand, one hundred seventy-two".