728756231 has 8 divisors (see below), whose sum is σ = 836813184. Its totient is φ = 621686520.

The previous prime is 728756183. The next prime is 728756269. The reversal of 728756231 is 132657827.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 728756231 - 2²² = 724561927 is a prime.

It is a super-2 number, since 2×728756231² = 1062171288442650722, 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 (728756531) 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 7 ways as a sum of consecutive naturals, for example, 245225 + ... + 248178.

It is an arithmetic number, because the mean of its divisors is an integer number (104601648).

Almost surely, 2^728756231 is an apocalyptic number.

728756231 is a deficient number, since it is larger than the sum of its proper divisors (108056953).

728756231 is a wasteful number, since it uses less digits than its factorization.

728756231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 493621.

The product of its digits is 141120, while the sum is 41.

The square root of 728756231 is about 26995.4853818189. The cubic root of 728756231 is about 899.8996723555.

The spelling of 728756231 in words is "seven hundred twenty-eight million, seven hundred fifty-six thousand, two hundred thirty-one".