728922911 has 4 divisors (see below), whose sum is σ = 729412632. Its totient is φ = 728433192.

The previous prime is 728922899. The next prime is 728922913. The reversal of 728922911 is 119229827.

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 728922911 - 2⁶ = 728922847 is a prime.

It is a super-2 number, since 2×728922911² = 1062657220361427842, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (728922913) 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, 242621 + ... + 245606.

It is an arithmetic number, because the mean of its divisors is an integer number (182353158).

Almost surely, 2^728922911 is an apocalyptic number.

728922911 is a deficient number, since it is larger than the sum of its proper divisors (489721).

728922911 is a wasteful number, since it uses less digits than its factorization.

728922911 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 489720.

The product of its digits is 36288, while the sum is 41.

The square root of 728922911 is about 26998.5723881838. The cubic root of 728922911 is about 899.9682750134.

The spelling of 728922911 in words is "seven hundred twenty-eight million, nine hundred twenty-two thousand, nine hundred eleven".