685946880 has 240 divisors, whose sum is σ = 2461619160. Its totient is φ = 182697984.

The previous prime is 685946819. The next prime is 685946881. The reversal of 685946880 is 88649586.

It is a happy number.

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 (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685946881) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 829027 + ... + 829853.

Almost surely, 2^685946880 is an apocalyptic number.

685946880 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 685946880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1230809580).

685946880 is an abundant number, since it is smaller than the sum of its proper divisors (1775672280).

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

685946880 is an equidigital number, since it uses as much as digits as its factorization.

685946880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 866 (or 837 counting only the distinct ones).

The product of its (nonzero) digits is 3317760, while the sum is 54.

The square root of 685946880 is about 26190.5876222738. The cubic root of 685946880 is about 881.9219700510.

The spelling of 685946880 in words is "six hundred eighty-five million, nine hundred forty-six thousand, eight hundred eighty".