728839231 has 4 divisors (see below), whose sum is σ = 729054000. Its totient is φ = 728624464.

The previous prime is 728839229. The next prime is 728839253. The reversal of 728839231 is 132938827.

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 728839231 - 2¹ = 728839229 is a prime.

It is a super-2 number, since 2×728839231² = 1062413249289342722, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 11.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (728839261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 102211 + ... + 109108.

It is an arithmetic number, because the mean of its divisors is an integer number (182263500).

Almost surely, 2^728839231 is an apocalyptic number.

728839231 is a deficient number, since it is larger than the sum of its proper divisors (214769).

728839231 is a wasteful number, since it uses less digits than its factorization.

728839231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 214768.

The product of its digits is 145152, while the sum is 43.

The square root of 728839231 is about 26997.0226321348. The cubic root of 728839231 is about 899.9338350536.

The spelling of 728839231 in words is "seven hundred twenty-eight million, eight hundred thirty-nine thousand, two hundred thirty-one".