728764919 has 2 divisors, whose sum is σ = 728764920. Its totient is φ = 728764918.

The previous prime is 728764879. The next prime is 728764937. The reversal of 728764919 is 919467827.

It is a strong prime.

It is an emirp because it is prime and its reverse (919467827) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-728764919 is a prime.

It is a super-2 number, since 2×728764919² = 1062196614330153122, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (728764219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 364382459 + 364382460.

It is an arithmetic number, because the mean of its divisors is an integer number (364382460).

Almost surely, 2^728764919 is an apocalyptic number.

728764919 is a deficient number, since it is larger than the sum of its proper divisors (1).

728764919 is an equidigital number, since it uses as much as digits as its factorization.

728764919 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1524096, while the sum is 53.

The square root of 728764919 is about 26995.6462971347. The cubic root of 728764919 is about 899.9032484472.

The spelling of 728764919 in words is "seven hundred twenty-eight million, seven hundred sixty-four thousand, nine hundred nineteen".