728428811 has 4 divisors (see below), whose sum is σ = 794649624. Its totient is φ = 662208000.

The previous prime is 728428787. The next prime is 728428819. The reversal of 728428811 is 118824827.

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 728428811 - 2¹⁰ = 728427787 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (728428819) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33110390 + ... + 33110411.

It is an arithmetic number, because the mean of its divisors is an integer number (198662406).

Almost surely, 2^728428811 is an apocalyptic number.

728428811 is a deficient number, since it is larger than the sum of its proper divisors (66220813).

728428811 is a wasteful number, since it uses less digits than its factorization.

728428811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66220812.

The product of its digits is 57344, while the sum is 41.

The square root of 728428811 is about 26989.4203531680. The cubic root of 728428811 is about 899.7648813806.

The spelling of 728428811 in words is "seven hundred twenty-eight million, four hundred twenty-eight thousand, eight hundred eleven".