728071 has 4 divisors (see below), whose sum is σ = 730944. Its totient is φ = 725200.

The previous prime is 728069. The next prime is 728087. The reversal of 728071 is 170827.

It is a happy number.

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 728071 - 2¹ = 728069 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 (728471) 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, 1015 + ... + 1576.

It is an arithmetic number, because the mean of its divisors is an integer number (182736).

2⁷²⁸⁰⁷¹ is an apocalyptic number.

728071 is a deficient number, since it is larger than the sum of its proper divisors (2873).

728071 is a wasteful number, since it uses less digits than its factorization.

728071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2872.

The product of its (nonzero) digits is 784, while the sum is 25.

The square root of 728071 is about 853.2707659354. The cubic root of 728071 is about 89.9617532962.

Adding to 728071 its reverse (170827), we get a palindrome (898898).

The spelling of 728071 in words is "seven hundred twenty-eight thousand, seventy-one".