685370172 has 24 divisors (see below), whose sum is σ = 1599720192. Its totient is φ = 228382000.

The previous prime is 685370159. The next prime is 685370177. The reversal of 685370172 is 271073586.

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 685370172.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685370177) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 38797 + ... + 53627.

It is an arithmetic number, because the mean of its divisors is an integer number (66655008).

Almost surely, 2^685370172 is an apocalyptic number.

It is an amenable number.

685370172 is an abundant number, since it is smaller than the sum of its proper divisors (914350020).

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

685370172 is a wasteful number, since it uses less digits than its factorization.

685370172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18689 (or 18687 counting only the distinct ones).

The product of its (nonzero) digits is 70560, while the sum is 39.

The square root of 685370172 is about 26179.5754740217. The cubic root of 685370172 is about 881.6747429090.

The spelling of 685370172 in words is "six hundred eighty-five million, three hundred seventy thousand, one hundred seventy-two".