6728739 has 8 divisors (see below), whose sum is σ = 9019392. Its totient is φ = 4461960.

The previous prime is 6728731. The next prime is 6728749. The reversal of 6728739 is 9378276.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 6728739 - 2³ = 6728731 is a prime.

6728739 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 6728739.

It is not an unprimeable number, because it can be changed into a prime (6728731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5299 + ... + 6444.

It is an arithmetic number, because the mean of its divisors is an integer number (1127424).

Almost surely, 2^6728739 is an apocalyptic number.

6728739 is a deficient number, since it is larger than the sum of its proper divisors (2290653).

6728739 is a wasteful number, since it uses less digits than its factorization.

6728739 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11937.

The product of its digits is 127008, while the sum is 42.

The square root of 6728739 is about 2593.9813029396. The cubic root of 6728739 is about 188.7895252226.

The spelling of 6728739 in words is "six million, seven hundred twenty-eight thousand, seven hundred thirty-nine".