728628091 has 2 divisors, whose sum is σ = 728628092. Its totient is φ = 728628090.

The previous prime is 728628071. The next prime is 728628101. The reversal of 728628091 is 190826827.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 728628091 - 2⁹ = 728627579 is a prime.

It is not a weakly prime, because it can be changed into another prime (728628031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 364314045 + 364314046.

It is an arithmetic number, because the mean of its divisors is an integer number (364314046).

Almost surely, 2^728628091 is an apocalyptic number.

728628091 is a deficient number, since it is larger than the sum of its proper divisors (1).

728628091 is an equidigital number, since it uses as much as digits as its factorization.

728628091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96768, while the sum is 43.

The square root of 728628091 is about 26993.1119176726. Note that the first 3 decimals coincide. The cubic root of 728628091 is about 899.8469249948.

The spelling of 728628091 in words is "seven hundred twenty-eight million, six hundred twenty-eight thousand, ninety-one".