636728633 has 2 divisors, whose sum is σ = 636728634. Its totient is φ = 636728632.

The previous prime is 636728629. The next prime is 636728641. The reversal of 636728633 is 336827636.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 528402169 + 108326464 = 22987^2 + 10408^2 .

It is a cyclic number.

It is not a de Polignac number, because 636728633 - 2² = 636728629 is a prime.

It is not a weakly prime, because it can be changed into another prime (636728663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 318364316 + 318364317.

It is an arithmetic number, because the mean of its divisors is an integer number (318364317).

Almost surely, 2^636728633 is an apocalyptic number.

It is an amenable number.

636728633 is a deficient number, since it is larger than the sum of its proper divisors (1).

636728633 is an equidigital number, since it uses as much as digits as its factorization.

636728633 is an evil number, because the sum of its binary digits is even.

The product of its digits is 653184, while the sum is 44.

The square root of 636728633 is about 25233.4823795686. The cubic root of 636728633 is about 860.3030449048.

The spelling of 636728633 in words is "six hundred thirty-six million, seven hundred twenty-eight thousand, six hundred thirty-three".