6728651 has 4 divisors (see below), whose sum is σ = 7124472. Its totient is φ = 6332832.

The previous prime is 6728639. The next prime is 6728653. The reversal of 6728651 is 1568276.

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

It is a cyclic number.

It is not a de Polignac number, because 6728651 - 2¹⁴ = 6712267 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6728653) 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, 197885 + ... + 197918.

It is an arithmetic number, because the mean of its divisors is an integer number (1781118).

Almost surely, 2^6728651 is an apocalyptic number.

6728651 is a deficient number, since it is larger than the sum of its proper divisors (395821).

6728651 is a wasteful number, since it uses less digits than its factorization.

6728651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 395820.

The product of its digits is 20160, while the sum is 35.

The square root of 6728651 is about 2593.9643405413. The cubic root of 6728651 is about 188.7887022081.

The spelling of 6728651 in words is "six million, seven hundred twenty-eight thousand, six hundred fifty-one".