728165839 has 2 divisors, whose sum is σ = 728165840. Its totient is φ = 728165838.

The previous prime is 728165819. The next prime is 728165857. The reversal of 728165839 is 938561827.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 728165839 - 2⁵ = 728165807 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 728165792 and 728165801.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (728165819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 364082919 + 364082920.

It is an arithmetic number, because the mean of its divisors is an integer number (364082920).

Almost surely, 2^728165839 is an apocalyptic number.

728165839 is a deficient number, since it is larger than the sum of its proper divisors (1).

728165839 is an equidigital number, since it uses as much as digits as its factorization.

728165839 is an evil number, because the sum of its binary digits is even.

The product of its digits is 725760, while the sum is 49.

The square root of 728165839 is about 26984.5481526002. The cubic root of 728165839 is about 899.6565928533.

The spelling of 728165839 in words is "seven hundred twenty-eight million, one hundred sixty-five thousand, eight hundred thirty-nine".