685189120 has 288 divisors, whose sum is σ = 2091398400. Its totient is φ = 210862080.

The previous prime is 685189117. The next prime is 685189181. The reversal of 685189120 is 21981586.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8673241 + ... + 8673319.

It is an arithmetic number, because the mean of its divisors is an integer number (7261800).

Almost surely, 2^685189120 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 685189120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1045699200).

685189120 is an abundant number, since it is smaller than the sum of its proper divisors (1406209280).

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

685189120 is a wasteful number, since it uses less digits than its factorization.

685189120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135 (or 104 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 40.

The square root of 685189120 is about 26176.1173591501. The cubic root of 685189120 is about 881.5970996926.

The spelling of 685189120 in words is "six hundred eighty-five million, one hundred eighty-nine thousand, one hundred twenty".