685812344 has 64 divisors (see below), whose sum is σ = 1566259200. Its totient is φ = 275134464.

The previous prime is 685812343. The next prime is 685812397. The reversal of 685812344 is 443218586.

685812344 = T₄₄₂₄ + T₄₄₂₅ + ... + T₄₄₉₂.

It is a hoax number, since the sum of its digits (41) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685812341) 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, 54872 + ... + 66200.

It is an arithmetic number, because the mean of its divisors is an integer number (24472800).

Almost surely, 2^685812344 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 685812344, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (783129600).

685812344 is an abundant number, since it is smaller than the sum of its proper divisors (880446856).

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

685812344 is a wasteful number, since it uses less digits than its factorization.

685812344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11412 (or 11408 counting only the distinct ones).

The product of its digits is 184320, while the sum is 41.

The square root of 685812344 is about 26188.0190927073. The cubic root of 685812344 is about 881.8643086317.

The spelling of 685812344 in words is "six hundred eighty-five million, eight hundred twelve thousand, three hundred forty-four".