643260287 has 2 divisors, whose sum is σ = 643260288. Its totient is φ = 643260286.

The previous prime is 643260269. The next prime is 643260329. The reversal of 643260287 is 782062346.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 643260287 - 2⁸ = 643260031 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 643260287.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (643260187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321630143 + 321630144.

It is an arithmetic number, because the mean of its divisors is an integer number (321630144).

Almost surely, 2^643260287 is an apocalyptic number.

643260287 is a deficient number, since it is larger than the sum of its proper divisors (1).

643260287 is an equidigital number, since it uses as much as digits as its factorization.

643260287 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96768, while the sum is 38.

The square root of 643260287 is about 25362.5765055524. The cubic root of 643260287 is about 863.2347472021.

The spelling of 643260287 in words is "six hundred forty-three million, two hundred sixty thousand, two hundred eighty-seven".