28039444 has 12 divisors (see below), whose sum is σ = 49131124. Its totient is φ = 14001984.

The previous prime is 28039439. The next prime is 28039463. The reversal of 28039444 is 44493082.

It can be written as a sum of positive squares in 2 ways, for example, as 12531600 + 15507844 = 3540^2 + 3938^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 489 + ... + 7504.

Almost surely, 2^28039444 is an apocalyptic number.

It is an amenable number.

28039444 is a deficient number, since it is larger than the sum of its proper divisors (21091680).

28039444 is a wasteful number, since it uses less digits than its factorization.

28039444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8874 (or 8872 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 34.

The square root of 28039444 is about 5295.2284181138. The cubic root of 28039444 is about 303.8014198261.

The spelling of 28039444 in words is "twenty-eight million, thirty-nine thousand, four hundred forty-four".