728513911 has 4 divisors (see below), whose sum is σ = 740456824. Its totient is φ = 716571000.

The previous prime is 728513897. The next prime is 728513917. The reversal of 728513911 is 119315827.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 728513911 - 2¹⁷ = 728382839 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (728513917) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5971365 + ... + 5971486.

It is an arithmetic number, because the mean of its divisors is an integer number (185114206).

Almost surely, 2^728513911 is an apocalyptic number.

728513911 is a deficient number, since it is larger than the sum of its proper divisors (11942913).

728513911 is a wasteful number, since it uses less digits than its factorization.

728513911 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11942912.

The product of its digits is 15120, while the sum is 37.

The square root of 728513911 is about 26990.9968508019. The cubic root of 728513911 is about 899.7999188973.

The spelling of 728513911 in words is "seven hundred twenty-eight million, five hundred thirteen thousand, nine hundred eleven".