685228512 has 144 divisors (see below), whose sum is σ = 1913079168. Its totient is φ = 214705920.

The previous prime is 685228507. The next prime is 685228517. The reversal of 685228512 is 215822586.

It is an interprime number because it is at equal distance from previous prime (685228507) and next prime (685228517).

It is a super-2 number, since 2×685228512² = 939076227315468288, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685228517) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5230687 + ... + 5230817.

It is an arithmetic number, because the mean of its divisors is an integer number (13285272).

Almost surely, 2^685228512 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 685228512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (956539584).

685228512 is an abundant number, since it is smaller than the sum of its proper divisors (1227850656).

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

685228512 is a wasteful number, since it uses less digits than its factorization.

685228512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 293 (or 262 counting only the distinct ones).

The product of its digits is 76800, while the sum is 39.

The square root of 685228512 is about 26176.8697899501. The cubic root of 685228512 is about 881.6139939127.

The spelling of 685228512 in words is "six hundred eighty-five million, two hundred twenty-eight thousand, five hundred twelve".