28321444 has 12 divisors (see below), whose sum is σ = 49604044. Its totient is φ = 14148864.

The previous prime is 28321417. The next prime is 28321459. The reversal of 28321444 is 44412382.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 8340544 + 19980900 = 2888^2 + 4470^2 .

It is a congruent number.

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, 4492 + ... + 8764.

Almost surely, 2^28321444 is an apocalyptic number.

It is an amenable number.

28321444 is a deficient number, since it is larger than the sum of its proper divisors (21282600).

28321444 is a wasteful number, since it uses less digits than its factorization.

28321444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5934 (or 5932 counting only the distinct ones).

The product of its digits is 6144, while the sum is 28.

The square root of 28321444 is about 5321.7895486387. The cubic root of 28321444 is about 304.8164944700.

The spelling of 28321444 in words is "twenty-eight million, three hundred twenty-one thousand, four hundred forty-four".