728751 has 8 divisors (see below), whose sum is σ = 975664. Its totient is φ = 483840.

The previous prime is 728747. The next prime is 728771. The reversal of 728751 is 157827.

It is a happy number.

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

It is not a de Polignac number, because 728751 - 2² = 728747 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 (728701) 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 7 ways as a sum of consecutive naturals, for example, 975 + ... + 1551.

It is an arithmetic number, because the mean of its divisors is an integer number (121958).

2⁷²⁸⁷⁵¹ is an apocalyptic number.

728751 is a deficient number, since it is larger than the sum of its proper divisors (246913).

728751 is a wasteful number, since it uses less digits than its factorization.

728751 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1001.

The product of its digits is 3920, while the sum is 30.

The square root of 728751 is about 853.6691396554. The cubic root of 728751 is about 89.9897519195.

The spelling of 728751 in words is "seven hundred twenty-eight thousand, seven hundred fifty-one".