685069980 has 144 divisors (see below), whose sum is σ = 2283684480. Its totient is φ = 152917632.

The previous prime is 685069967. The next prime is 685069981. The reversal of 685069980 is 89960586.

685069980 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685069981) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 123711 + ... + 129129.

It is an arithmetic number, because the mean of its divisors is an integer number (15858920).

Almost surely, 2^685069980 is an apocalyptic number.

685069980 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 685069980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1141842240).

685069980 is an abundant number, since it is smaller than the sum of its proper divisors (1598614500).

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

685069980 is a wasteful number, since it uses less digits than its factorization.

685069980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5488 (or 5479 counting only the distinct ones).

The product of its (nonzero) digits is 933120, while the sum is 51.

The square root of 685069980 is about 26173.8415216414. The cubic root of 685069980 is about 881.5459996563.

The spelling of 685069980 in words is "six hundred eighty-five million, sixty-nine thousand, nine hundred eighty".