723428 has 12 divisors (see below), whose sum is σ = 1281840. Its totient is φ = 357192.

The previous prime is 723421. The next prime is 723439. The reversal of 723428 is 824327.

It is a junction number, because it is equal to n+sod(n) for n = 723397 and 723406.

It is not an unprimeable number, because it can be changed into a prime (723421) 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, 758 + ... + 1421.

It is an arithmetic number, because the mean of its divisors is an integer number (106820).

2⁷²³⁴²⁸ is an apocalyptic number.

It is an amenable number.

723428 is a deficient number, since it is larger than the sum of its proper divisors (558412).

723428 is a wasteful number, since it uses less digits than its factorization.

723428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2266 (or 2264 counting only the distinct ones).

The product of its digits is 2688, while the sum is 26.

The square root of 723428 is about 850.5457071786. The cubic root of 723428 is about 89.7701128875.

The spelling of 723428 in words is "seven hundred twenty-three thousand, four hundred twenty-eight".