728122 has 8 divisors (see below), whose sum is σ = 1099872. Its totient is φ = 361500.

The previous prime is 728113. The next prime is 728129. The reversal of 728122 is 221827.

728122 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a junction number, because it is equal to n+sod(n) for n = 728093 and 728102.

It is not an unprimeable number, because it can be changed into a prime (728129) 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, 904 + ... + 1507.

It is an arithmetic number, because the mean of its divisors is an integer number (137484).

2⁷²⁸¹²² is an apocalyptic number.

728122 is a deficient number, since it is larger than the sum of its proper divisors (371750).

728122 is a wasteful number, since it uses less digits than its factorization.

728122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2564.

The product of its digits is 448, while the sum is 22.

The square root of 728122 is about 853.3006504158. The cubic root of 728122 is about 89.9638537975.

Adding to 728122 its reverse (221827), we get a palindrome (949949).

The spelling of 728122 in words is "seven hundred twenty-eight thousand, one hundred twenty-two".