728419 has 4 divisors (see below), whose sum is σ = 748144. Its totient is φ = 708696.

The previous prime is 728417. The next prime is 728423. The reversal of 728419 is 914827.

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 728419 - 2¹ = 728417 is a prime.

It is a super-2 number, since 2×728419² = 1061188479122, which contains 22 as substring.

It is a Duffinian number.

728419 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (728417) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9807 + ... + 9880.

It is an arithmetic number, because the mean of its divisors is an integer number (187036).

2⁷²⁸⁴¹⁹ is an apocalyptic number.

728419 is a deficient number, since it is larger than the sum of its proper divisors (19725).

728419 is a wasteful number, since it uses less digits than its factorization.

728419 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19724.

The product of its digits is 4032, while the sum is 31.

The square root of 728419 is about 853.4746627756. The cubic root of 728419 is about 89.9760841804.

The spelling of 728419 in words is "seven hundred twenty-eight thousand, four hundred nineteen".