685122216 has 128 divisors (see below), whose sum is σ = 1886976000. Its totient is φ = 206454528.

The previous prime is 685122211. The next prime is 685122223. The reversal of 685122216 is 612221586.

It is not an unprimeable number, because it can be changed into a prime (685122211) 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, 1361821 + ... + 1362323.

It is an arithmetic number, because the mean of its divisors is an integer number (14742000).

Almost surely, 2^685122216 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 685122216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (943488000).

685122216 is an abundant number, since it is smaller than the sum of its proper divisors (1201853784).

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

685122216 is a wasteful number, since it uses less digits than its factorization.

685122216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 663 (or 659 counting only the distinct ones).

The product of its digits is 11520, while the sum is 33.

The square root of 685122216 is about 26174.8393691346. The cubic root of 685122216 is about 881.5684047963.

The spelling of 685122216 in words is "six hundred eighty-five million, one hundred twenty-two thousand, two hundred sixteen".