685849237920 has 864 divisors, whose sum is σ = 2980744655616. Its totient is φ = 140543631360.

The previous prime is 685849237901. The next prime is 685849237933. The reversal of 685849237920 is 29732948586.

685849237920 is a `hidden beast` number, since 6 + 8 + 58 + 492 + 3 + 7 + 92 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 89032789 + ... + 89040491.

It is an arithmetic number, because the mean of its divisors is an integer number (3449935944).

Almost surely, 2^685849237920 is an apocalyptic number.

685849237920 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 685849237920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1490372327808).

685849237920 is an abundant number, since it is smaller than the sum of its proper divisors (2294895417696).

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

685849237920 is a wasteful number, since it uses less digits than its factorization.

685849237920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7826 (or 7804 counting only the distinct ones).

The product of its (nonzero) digits is 52254720, while the sum is 63.

The spelling of 685849237920 in words is "six hundred eighty-five billion, eight hundred forty-nine million, two hundred thirty-seven thousand, nine hundred twenty".