685459998720 has 2304 divisors, whose sum is σ = 3090866688000. Its totient is φ = 142244315136.

The previous prime is 685459998679. The next prime is 685459998731. The reversal of 685459998720 is 27899954586.

685459998720 is a `hidden beast` number, since 6 + 8 + 5 + 4 + 599 + 9 + 8 + 7 + 20 = 666.

It is a tau number, because it is divible by the number of its divisors (2304).

It is a Harshad number since it is a multiple of its sum of digits (72).

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 11617966051 + ... + 11617966109.

It is an arithmetic number, because the mean of its divisors is an integer number (1341522000).

Almost surely, 2^685459998720 is an apocalyptic number.

685459998720 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 685459998720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1545433344000).

685459998720 is an abundant number, since it is smaller than the sum of its proper divisors (2405406689280).

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

685459998720 is a wasteful number, since it uses less digits than its factorization.

685459998720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160 (or 128 counting only the distinct ones).

The product of its (nonzero) digits is 391910400, while the sum is 72.

The spelling of 685459998720 in words is "six hundred eighty-five billion, four hundred fifty-nine million, nine hundred ninety-eight thousand, seven hundred twenty".