685741920 has 192 divisors, whose sum is σ = 2408071680. Its totient is φ = 163012608.

The previous prime is 685741867. The next prime is 685741957. The reversal of 685741920 is 29147586.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 152829 + ... + 157251.

It is an arithmetic number, because the mean of its divisors is an integer number (12542040).

Almost surely, 2^685741920 is an apocalyptic number.

685741920 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 685741920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1204035840).

685741920 is an abundant number, since it is smaller than the sum of its proper divisors (1722329760).

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

685741920 is a wasteful number, since it uses less digits than its factorization.

685741920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4477 (or 4469 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 42.

The square root of 685741920 is about 26186.6744738617. The cubic root of 685741920 is about 881.8341222702.

The spelling of 685741920 in words is "six hundred eighty-five million, seven hundred forty-one thousand, nine hundred twenty".