636828641 has 2 divisors, whose sum is σ = 636828642. Its totient is φ = 636828640.

The previous prime is 636828611. The next prime is 636828659. The reversal of 636828641 is 146828636.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 391248400 + 245580241 = 19780^2 + 15671^2 .

It is a cyclic number.

It is not a de Polignac number, because 636828641 - 2¹⁴ = 636812257 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 636828592 and 636828601.

It is not a weakly prime, because it can be changed into another prime (636828601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 318414320 + 318414321.

It is an arithmetic number, because the mean of its divisors is an integer number (318414321).

Almost surely, 2^636828641 is an apocalyptic number.

It is an amenable number.

636828641 is a deficient number, since it is larger than the sum of its proper divisors (1).

636828641 is an equidigital number, since it uses as much as digits as its factorization.

636828641 is an evil number, because the sum of its binary digits is even.

The product of its digits is 331776, while the sum is 44.

The square root of 636828641 is about 25235.4639545224. The cubic root of 636828641 is about 860.3480838106.

The spelling of 636828641 in words is "six hundred thirty-six million, eight hundred twenty-eight thousand, six hundred forty-one".