636728673 has 16 divisors (see below), whose sum is σ = 972477440. Its totient is φ = 363010896.

The previous prime is 636728663. The next prime is 636728683. The reversal of 636728673 is 376827636.

It is an interprime number because it is at equal distance from previous prime (636728663) and next prime (636728683).

It is not a de Polignac number, because 636728673 - 2⁴ = 636728657 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (636728633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25315 + ... + 43752.

It is an arithmetic number, because the mean of its divisors is an integer number (60779840).

Almost surely, 2^636728673 is an apocalyptic number.

It is an amenable number.

636728673 is a deficient number, since it is larger than the sum of its proper divisors (335748767).

636728673 is a wasteful number, since it uses less digits than its factorization.

636728673 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69516.

The product of its digits is 1524096, while the sum is 48.

The square root of 636728673 is about 25233.4831721663. The cubic root of 636728673 is about 860.3030629198.

The spelling of 636728673 in words is "six hundred thirty-six million, seven hundred twenty-eight thousand, six hundred seventy-three".