782670643 has 2 divisors, whose sum is σ = 782670644. Its totient is φ = 782670642.

The previous prime is 782670641. The next prime is 782670659. The reversal of 782670643 is 346076287.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 782670643 - 2¹ = 782670641 is a prime.

It is a super-2 number, since 2×782670643² = 1225146670828066898, which contains 22 as substring.

Together with 782670641, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 782670643.

It is not a weakly prime, because it can be changed into another prime (782670641) 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 as a sum of consecutive naturals, namely, 391335321 + 391335322.

It is an arithmetic number, because the mean of its divisors is an integer number (391335322).

Almost surely, 2^782670643 is an apocalyptic number.

782670643 is a deficient number, since it is larger than the sum of its proper divisors (1).

782670643 is an equidigital number, since it uses as much as digits as its factorization.

782670643 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 338688, while the sum is 43.

The square root of 782670643 is about 27976.2514107948. The cubic root of 782670643 is about 921.5657972633.

The spelling of 782670643 in words is "seven hundred eighty-two million, six hundred seventy thousand, six hundred forty-three".