685446660 has 288 divisors, whose sum is σ = 2306304000. Its totient is φ = 164166912.

The previous prime is 685446653. The next prime is 685446683. The reversal of 685446660 is 66644586.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 8676501 + ... + 8676579.

It is an arithmetic number, because the mean of its divisors is an integer number (8008000).

Almost surely, 2^685446660 is an apocalyptic number.

685446660 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 685446660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1153152000).

685446660 is an abundant number, since it is smaller than the sum of its proper divisors (1620857340).

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

685446660 is a wasteful number, since it uses less digits than its factorization.

685446660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 215 (or 210 counting only the distinct ones).

The product of its (nonzero) digits is 829440, while the sum is 45.

The square root of 685446660 is about 26181.0362667332. The cubic root of 685446660 is about 881.7075402848.

The spelling of 685446660 in words is "six hundred eighty-five million, four hundred forty-six thousand, six hundred sixty".