728791643 has 2 divisors, whose sum is σ = 728791644. Its totient is φ = 728791642.

The previous prime is 728791601. The next prime is 728791667. The reversal of 728791643 is 346197827.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 728791643 - 2⁸ = 728791387 is a prime.

It is a super-2 number, since 2×728791643² = 1062274517813278898, which contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (728793643) 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, 364395821 + 364395822.

It is an arithmetic number, because the mean of its divisors is an integer number (364395822).

Almost surely, 2^728791643 is an apocalyptic number.

728791643 is a deficient number, since it is larger than the sum of its proper divisors (1).

728791643 is an equidigital number, since it uses as much as digits as its factorization.

728791643 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 508032, while the sum is 47.

The square root of 728791643 is about 26996.1412612988. The cubic root of 728791643 is about 899.9142482084.

The spelling of 728791643 in words is "seven hundred twenty-eight million, seven hundred ninety-one thousand, six hundred forty-three".