680865744 has 80 divisors (see below), whose sum is σ = 1920279872. Its totient is φ = 206613504.

The previous prime is 680865743. The next prime is 680865761. The reversal of 680865744 is 447568086.

It is a super-2 number, since 2×680865744² = 927156322705347072, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a junction number, because it is equal to n+sod(n) for n = 680865693 and 680865702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (680865743) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38079 + ... + 53025.

Almost surely, 2^680865744 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 680865744, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (960139936).

680865744 is an abundant number, since it is smaller than the sum of its proper divisors (1239414128).

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

680865744 is a wasteful number, since it uses less digits than its factorization.

680865744 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15044 (or 15038 counting only the distinct ones).

The product of its (nonzero) digits is 1290240, while the sum is 48.

The square root of 680865744 is about 26093.4042240563. The cubic root of 680865744 is about 879.7389652766.

The spelling of 680865744 in words is "six hundred eighty million, eight hundred sixty-five thousand, seven hundred forty-four".