685169280 has 160 divisors (see below), whose sum is σ = 2447048340. Its totient is φ = 182697984.

The previous prime is 685169237. The next prime is 685169321. The reversal of 685169280 is 82961586.

It can be written as a sum of positive squares in 2 ways, for example, as 675584064 + 9585216 = 25992^2 + 3096^2 .

It is a tau number, because it is divible by the number of its divisors (160).

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 45232 + ... + 58448.

Almost surely, 2^685169280 is an apocalyptic number.

685169280 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 685169280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1223524170).

685169280 is an abundant number, since it is smaller than the sum of its proper divisors (1761879060).

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

685169280 is a wasteful number, since it uses less digits than its factorization.

685169280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13248 (or 13227 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 45.

The square root of 685169280 is about 26175.7383850007. The cubic root of 685169280 is about 881.5885905794.

The spelling of 685169280 in words is "six hundred eighty-five million, one hundred sixty-nine thousand, two hundred eighty".