685593720 has 640 divisors, whose sum is σ = 2913292800. Its totient is φ = 141087744.

The previous prime is 685593703. The next prime is 685593773. The reversal of 685593720 is 27395586.

It is a happy number.

685593720 is a `hidden beast` number, since 68 + 559 + 37 + 2 + 0 = 666.

685593720 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 15944019 + ... + 15944061.

It is an arithmetic number, because the mean of its divisors is an integer number (4552020).

Almost surely, 2^685593720 is an apocalyptic number.

685593720 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 685593720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1456646400).

685593720 is an abundant number, since it is smaller than the sum of its proper divisors (2227699080).

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

685593720 is a wasteful number, since it uses less digits than its factorization.

685593720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129 (or 116 counting only the distinct ones).

The product of its (nonzero) digits is 453600, while the sum is 45.

The square root of 685593720 is about 26183.8446374859. The cubic root of 685593720 is about 881.7705914535.

The spelling of 685593720 in words is "six hundred eighty-five million, five hundred ninety-three thousand, seven hundred twenty".