28233428 has 6 divisors (see below), whose sum is σ = 49408506. Its totient is φ = 14116712.

The previous prime is 28233421. The next prime is 28233437. The reversal of 28233428 is 82433282.

It can be written as a sum of positive squares in only one way, i.e., 28174864 + 58564 = 5308^2 + 242^2 .

It is a junction number, because it is equal to n+sod(n) for n = 28233394 and 28233403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28233421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3529175 + ... + 3529182.

It is an arithmetic number, because the mean of its divisors is an integer number (8234751).

Almost surely, 2^28233428 is an apocalyptic number.

It is an amenable number.

28233428 is a deficient number, since it is larger than the sum of its proper divisors (21175078).

28233428 is a wasteful number, since it uses less digits than its factorization.

28233428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7058361 (or 7058359 counting only the distinct ones).

The product of its digits is 18432, while the sum is 32.

The square root of 28233428 is about 5313.5137150477. The cubic root of 28233428 is about 304.5004021950.

The spelling of 28233428 in words is "twenty-eight million, two hundred thirty-three thousand, four hundred twenty-eight".