685528320 has 144 divisors (see below), whose sum is σ = 2204576640. Its totient is φ = 181542912.

The previous prime is 685528301. The next prime is 685528331. The reversal of 685528320 is 23825586.

It is a super-5 number, since 5×685528320⁵ (a number of 45 digits) contains 55555 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 640746 + ... + 641814.

It is an arithmetic number, because the mean of its divisors is an integer number (15309560).

Almost surely, 2^685528320 is an apocalyptic number.

685528320 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 685528320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1102288320).

685528320 is an abundant number, since it is smaller than the sum of its proper divisors (1519048320).

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

685528320 is a wasteful number, since it uses less digits than its factorization.

685528320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1260 (or 1246 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 39.

The square root of 685528320 is about 26182.5957460295. The cubic root of 685528320 is about 881.7425526755.

The spelling of 685528320 in words is "six hundred eighty-five million, five hundred twenty-eight thousand, three hundred twenty".