422728 has 16 divisors (see below), whose sum is σ = 808380. Its totient is φ = 207168.

The previous prime is 422711. The next prime is 422749. The reversal of 422728 is 827224.

It can be written as a sum of positive squares in 2 ways, for example, as 381924 + 40804 = 618^2 + 202^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 75 + ... + 922.

2⁴²²⁷²⁸ is an apocalyptic number.

It is an amenable number.

422728 is a deficient number, since it is larger than the sum of its proper divisors (385652).

422728 is a wasteful number, since it uses less digits than its factorization.

422728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1056 (or 1052 counting only the distinct ones).

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

The square root of 422728 is about 650.1753609604. The cubic root of 422728 is about 75.0505141182.

Subtracting 422728 from its reverse (827224), we obtain a square (404496 = 636²).

The spelling of 422728 in words is "four hundred twenty-two thousand, seven hundred twenty-eight".