728856019 has 2 divisors, whose sum is σ = 728856020. Its totient is φ = 728856018.

The previous prime is 728856013. The next prime is 728856061. The reversal of 728856019 is 910658827.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 728856019 - 2⁵ = 728855987 is a prime.

It is a super-2 number, since 2×728856019² = 1062462192865056722, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 728856019.

It is not a weakly prime, because it can be changed into another prime (728856013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 364428009 + 364428010.

It is an arithmetic number, because the mean of its divisors is an integer number (364428010).

Almost surely, 2^728856019 is an apocalyptic number.

728856019 is a deficient number, since it is larger than the sum of its proper divisors (1).

728856019 is an equidigital number, since it uses as much as digits as its factorization.

728856019 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 241920, while the sum is 46.

The square root of 728856019 is about 26997.3335535197. Note that the first 3 decimals coincide. The cubic root of 728856019 is about 899.9407446584.

The spelling of 728856019 in words is "seven hundred twenty-eight million, eight hundred fifty-six thousand, nineteen".