728719 has 4 divisors (see below), whose sum is σ = 731680. Its totient is φ = 725760.

The previous prime is 728713. The next prime is 728723. The reversal of 728719 is 917827.

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 728719 - 2⁵ = 728687 is a prime.

It is a super-2 number, since 2×728719² = 1062062761922, 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 (728713) 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, 1074 + ... + 1615.

It is an arithmetic number, because the mean of its divisors is an integer number (182920).

2⁷²⁸⁷¹⁹ is an apocalyptic number.

728719 is a deficient number, since it is larger than the sum of its proper divisors (2961).

728719 is a wasteful number, since it uses less digits than its factorization.

728719 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2960.

The product of its digits is 7056, while the sum is 34.

The square root of 728719 is about 853.6503968253. The cubic root of 728719 is about 89.9884347279.

The spelling of 728719 in words is "seven hundred twenty-eight thousand, seven hundred nineteen".