685071780 has 96 divisors (see below), whose sum is σ = 2050344576. Its totient is φ = 170305536.

The previous prime is 685071773. The next prime is 685071781. The reversal of 685071780 is 87170586.

685071780 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (685071781) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 106002 + ... + 112278.

It is an arithmetic number, because the mean of its divisors is an integer number (21357756).

Almost surely, 2^685071780 is an apocalyptic number.

685071780 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 685071780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1025172288).

685071780 is an abundant number, since it is smaller than the sum of its proper divisors (1365272796).

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

685071780 is a wasteful number, since it uses less digits than its factorization.

685071780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6413 (or 6411 counting only the distinct ones).

The product of its (nonzero) digits is 94080, while the sum is 42.

The square root of 685071780 is about 26173.8759070948. The cubic root of 685071780 is about 881.5467717338.

The spelling of 685071780 in words is "six hundred eighty-five million, seventy-one thousand, seven hundred eighty".