685240320 has 208 divisors, whose sum is σ = 2311827840. Its totient is φ = 172818432.

The previous prime is 685240277. The next prime is 685240327. The reversal of 685240320 is 23042586.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685240327) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1167067 + ... + 1167653.

Almost surely, 2^685240320 is an apocalyptic number.

685240320 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 685240320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1155913920).

685240320 is an abundant number, since it is smaller than the sum of its proper divisors (1626587520).

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

685240320 is a wasteful number, since it uses less digits than its factorization.

685240320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 638 (or 616 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 30.

The square root of 685240320 is about 26177.0953316062. The cubic root of 685240320 is about 881.6190579354.

The spelling of 685240320 in words is "six hundred eighty-five million, two hundred forty thousand, three hundred twenty".