685894902 has 128 divisors (see below), whose sum is σ = 1789820928. Its totient is φ = 170035200.

The previous prime is 685894901. The next prime is 685894973. The reversal of 685894902 is 209498586.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685894901) 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 63 ways as a sum of consecutive naturals, for example, 1188438 + ... + 1189014.

It is an arithmetic number, because the mean of its divisors is an integer number (13982976).

Almost surely, 2^685894902 is an apocalyptic number.

685894902 is a gapful number since it is divisible by the number (62) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 685894902, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (894910464).

685894902 is an abundant number, since it is smaller than the sum of its proper divisors (1103926026).

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

685894902 is a wasteful number, since it uses less digits than its factorization.

685894902 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 714.

The product of its (nonzero) digits is 1244160, while the sum is 51.

The square root of 685894902 is about 26189.5953004242. The cubic root of 685894902 is about 881.8996934484.

The spelling of 685894902 in words is "six hundred eighty-five million, eight hundred ninety-four thousand, nine hundred two".