1028733649 has 2 divisors, whose sum is σ = 1028733650. Its totient is φ = 1028733648.

The previous prime is 1028733637. The next prime is 1028733679. The reversal of 1028733649 is 9463378201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 932203024 + 96530625 = 30532^2 + 9825^2 .

It is an emirp because it is prime and its reverse (9463378201) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1028733649 - 2⁷ = 1028733521 is a prime.

It is not a weakly prime, because it can be changed into another prime (1028733619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 514366824 + 514366825.

It is an arithmetic number, because the mean of its divisors is an integer number (514366825).

Almost surely, 2^1028733649 is an apocalyptic number.

It is an amenable number.

1028733649 is a deficient number, since it is larger than the sum of its proper divisors (1).

1028733649 is an equidigital number, since it uses as much as digits as its factorization.

1028733649 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 217728, while the sum is 43.

The square root of 1028733649 is about 32073.8779850519. The cubic root of 1028733649 is about 1009.4875840758.

The spelling of 1028733649 in words is "one billion, twenty-eight million, seven hundred thirty-three thousand, six hundred forty-nine".