685943136 has 72 divisors (see below), whose sum is σ = 1954101240. Its totient is φ = 228243456.

The previous prime is 685943131. The next prime is 685943147. The reversal of 685943136 is 631349586.

It is a tau number, because it is divible by the number of its divisors (72).

It is a junction number, because it is equal to n+sod(n) for n = 685943091 and 685943100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685943131) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 192055 + ... + 195593.

It is an arithmetic number, because the mean of its divisors is an integer number (27140295).

Almost surely, 2^685943136 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 685943136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (977050620).

685943136 is an abundant number, since it is smaller than the sum of its proper divisors (1268158104).

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

685943136 is a wasteful number, since it uses less digits than its factorization.

685943136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4228 (or 4217 counting only the distinct ones).

The product of its digits is 466560, while the sum is 45.

The square root of 685943136 is about 26190.5161461167. The cubic root of 685943136 is about 881.9203654944.

The spelling of 685943136 in words is "six hundred eighty-five million, nine hundred forty-three thousand, one hundred thirty-six".