728491999 has 2 divisors, whose sum is σ = 728492000. Its totient is φ = 728491998.

The previous prime is 728491997. The next prime is 728492003. The reversal of 728491999 is 999194827.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 728491999 - 2¹ = 728491997 is a prime.

Together with 728491997, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (728491991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 364245999 + 364246000.

It is an arithmetic number, because the mean of its divisors is an integer number (364246000).

Almost surely, 2^728491999 is an apocalyptic number.

728491999 is a deficient number, since it is larger than the sum of its proper divisors (1).

728491999 is an equidigital number, since it uses as much as digits as its factorization.

728491999 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2939328, while the sum is 58.

The square root of 728491999 is about 26990.5909346202. The cubic root of 728491999 is about 899.7908975122.

The spelling of 728491999 in words is "seven hundred twenty-eight million, four hundred ninety-one thousand, nine hundred ninety-nine".