680737 has 4 divisors (see below), whose sum is σ = 684720. Its totient is φ = 676756.

The previous prime is 680707. The next prime is 680749. The reversal of 680737 is 737086.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-680737 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a nialpdrome in base 16.

It is a junction number, because it is equal to n+sod(n) for n = 680699 and 680708.

It is not an unprimeable number, because it can be changed into a prime (680707) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1723 + ... + 2080.

It is an arithmetic number, because the mean of its divisors is an integer number (171180).

2⁶⁸⁰⁷³⁷ is an apocalyptic number.

It is an amenable number.

680737 is a deficient number, since it is larger than the sum of its proper divisors (3983).

680737 is a wasteful number, since it uses less digits than its factorization.

680737 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3982.

The product of its (nonzero) digits is 7056, while the sum is 31.

The square root of 680737 is about 825.0678759957. The cubic root of 680737 is about 87.9683512223.

The spelling of 680737 in words is "six hundred eighty thousand, seven hundred thirty-seven".