728422 has 16 divisors (see below), whose sum is σ = 1191600. Its totient is φ = 332640.

The previous prime is 728417. The next prime is 728423. The reversal of 728422 is 224827.

It is a super-2 number, since 2×728422² = 1061197220168, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (728423) by changing a digit.

728422 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

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 7 ways as a sum of consecutive naturals, for example, 772 + ... + 1432.

It is an arithmetic number, because the mean of its divisors is an integer number (74475).

2⁷²⁸⁴²² is an apocalyptic number.

728422 is a deficient number, since it is larger than the sum of its proper divisors (463178).

728422 is a wasteful number, since it uses less digits than its factorization.

728422 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 711.

The product of its digits is 1792, while the sum is 25.

The square root of 728422 is about 853.4764202953. The cubic root of 728422 is about 89.9762077026.

The spelling of 728422 in words is "seven hundred twenty-eight thousand, four hundred twenty-two".