680862644 has 108 divisors (see below), whose sum is σ = 1604746080. Its totient is φ = 251143200.

The previous prime is 680862613. The next prime is 680862649. The reversal of 680862644 is 446268086.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a junction number, because it is equal to n+sod(n) for n = 680862595 and 680862604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (680862649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 449849 + ... + 451359.

It is an arithmetic number, because the mean of its divisors is an integer number (14858760).

Almost surely, 2^680862644 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 680862644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (802373040).

680862644 is an abundant number, since it is smaller than the sum of its proper divisors (923883436).

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

680862644 is a wasteful number, since it uses less digits than its factorization.

680862644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1570 (or 1550 counting only the distinct ones).

The product of its (nonzero) digits is 442368, while the sum is 44.

The square root of 680862644 is about 26093.3448220039. The cubic root of 680862644 is about 879.7376301162.

The spelling of 680862644 in words is "six hundred eighty million, eight hundred sixty-two thousand, six hundred forty-four".