728311 has 4 divisors (see below), whose sum is σ = 735624. Its totient is φ = 721000.

The previous prime is 728303. The next prime is 728317. The reversal of 728311 is 113827.

728311 = T₆₆ + T₆₇ + ... + T₁₆₆.

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 728311 - 2³ = 728303 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 (728317) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3505 + ... + 3706.

It is an arithmetic number, because the mean of its divisors is an integer number (183906).

2⁷²⁸³¹¹ is an apocalyptic number.

728311 is a deficient number, since it is larger than the sum of its proper divisors (7313).

728311 is a wasteful number, since it uses less digits than its factorization.

728311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7312.

The product of its digits is 336, while the sum is 22.

The square root of 728311 is about 853.4113896592. The cubic root of 728311 is about 89.9716371531.

The spelling of 728311 in words is "seven hundred twenty-eight thousand, three hundred eleven".