728428823 has 2 divisors, whose sum is σ = 728428824. Its totient is φ = 728428822.

The previous prime is 728428819. The next prime is 728428829. The reversal of 728428823 is 328824827.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 728428823 - 2² = 728428819 is a prime.

It is a super-3 number, since 3×728428823³ (a number of 28 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (728428829) 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, 364214411 + 364214412.

It is an arithmetic number, because the mean of its divisors is an integer number (364214412).

Almost surely, 2^728428823 is an apocalyptic number.

728428823 is a deficient number, since it is larger than the sum of its proper divisors (1).

728428823 is an equidigital number, since it uses as much as digits as its factorization.

728428823 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 344064, while the sum is 44.

The square root of 728428823 is about 26989.4205754773. The cubic root of 728428823 is about 899.7648863215.

The spelling of 728428823 in words is "seven hundred twenty-eight million, four hundred twenty-eight thousand, eight hundred twenty-three".