6728731 has 2 divisors, whose sum is σ = 6728732. Its totient is φ = 6728730.

The previous prime is 6728723. The next prime is 6728749. The reversal of 6728731 is 1378276.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6728731 - 2³ = 6728723 is a prime.

It is a super-2 number, since 2×6728731² = 90551641740722, which contains 22 as substring.

6728731 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (6728131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3364365 + 3364366.

It is an arithmetic number, because the mean of its divisors is an integer number (3364366).

Almost surely, 2^6728731 is an apocalyptic number.

6728731 is a deficient number, since it is larger than the sum of its proper divisors (1).

6728731 is an equidigital number, since it uses as much as digits as its factorization.

6728731 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14112, while the sum is 34.

The square root of 6728731 is about 2593.9797609079. The cubic root of 6728731 is about 188.7894504034.

The spelling of 6728731 in words is "six million, seven hundred twenty-eight thousand, seven hundred thirty-one".