682721 has 4 divisors (see below), whose sum is σ = 735252. Its totient is φ = 630192.

The previous prime is 682699. The next prime is 682723. The reversal of 682721 is 127286.

682721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 192721 + 490000 = 439^2 + 700^2 .

It is a cyclic number.

It is not a de Polignac number, because 682721 - 2⁶ = 682657 is a prime.

It is a super-2 number, since 2×682721² = 932215927682, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 682721.

It is not an unprimeable number, because it can be changed into a prime (682723) 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, 26246 + ... + 26271.

It is an arithmetic number, because the mean of its divisors is an integer number (183813).

2⁶⁸²⁷²¹ is an apocalyptic number.

It is an amenable number.

682721 is a deficient number, since it is larger than the sum of its proper divisors (52531).

682721 is a wasteful number, since it uses less digits than its factorization.

682721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52530.

The product of its digits is 1344, while the sum is 26.

The square root of 682721 is about 826.2693265516. The cubic root of 682721 is about 88.0537292408.

The spelling of 682721 in words is "six hundred eighty-two thousand, seven hundred twenty-one".