685055280 has 240 divisors, whose sum is σ = 2661017184. Its totient is φ = 144506880.

The previous prime is 685055251. The next prime is 685055281. The reversal of 685055280 is 82550586.

It is a tau number, because it is divible by the number of its divisors (240).

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (685055281) by changing a digit.

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 47 ways as a sum of consecutive naturals, for example, 150640 + ... + 155120.

Almost surely, 2^685055280 is an apocalyptic number.

685055280 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 685055280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1330508592).

685055280 is an abundant number, since it is smaller than the sum of its proper divisors (1975961904).

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

685055280 is a wasteful number, since it uses less digits than its factorization.

685055280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4524 (or 4511 counting only the distinct ones).

The product of its (nonzero) digits is 96000, while the sum is 39.

The square root of 685055280 is about 26173.5607054142. The cubic root of 685055280 is about 881.5396943058.

The spelling of 685055280 in words is "six hundred eighty-five million, fifty-five thousand, two hundred eighty".