685642748 has 72 divisors (see below), whose sum is σ = 1438690176. Its totient is φ = 280026720.

The previous prime is 685642709. The next prime is 685642751. The reversal of 685642748 is 847246586.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 685642696 and 685642705.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2233211 + ... + 2233517.

It is an arithmetic number, because the mean of its divisors is an integer number (19981808).

Almost surely, 2^685642748 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 685642748, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (719345088).

685642748 is an abundant number, since it is smaller than the sum of its proper divisors (753047428).

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

685642748 is a wasteful number, since it uses less digits than its factorization.

685642748 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 463 (or 430 counting only the distinct ones).

The product of its digits is 2580480, while the sum is 50.

The square root of 685642748 is about 26184.7808468965. The cubic root of 685642748 is about 881.7916099357.

The spelling of 685642748 in words is "six hundred eighty-five million, six hundred forty-two thousand, seven hundred forty-eight".