728438699 has 2 divisors, whose sum is σ = 728438700. Its totient is φ = 728438698.

The previous prime is 728438671. The next prime is 728438723. The reversal of 728438699 is 996834827.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-728438699 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (728438609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 364219349 + 364219350.

It is an arithmetic number, because the mean of its divisors is an integer number (364219350).

Almost surely, 2^728438699 is an apocalyptic number.

728438699 is a deficient number, since it is larger than the sum of its proper divisors (1).

728438699 is an equidigital number, since it uses as much as digits as its factorization.

728438699 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5225472, while the sum is 56.

The square root of 728438699 is about 26989.6035354356. The cubic root of 728438699 is about 899.7689526249.

The spelling of 728438699 in words is "seven hundred twenty-eight million, four hundred thirty-eight thousand, six hundred ninety-nine".