28049984 has 14 divisors (see below), whose sum is σ = 55661814. Its totient is φ = 14024960.

The previous prime is 28049971. The next prime is 28049999. The reversal of 28049984 is 48994082.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 16974400 + 11075584 = 4120^2 + 3328^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 219077 + ... + 219204.

Almost surely, 2^28049984 is an apocalyptic number.

It is an amenable number.

28049984 is a deficient number, since it is larger than the sum of its proper divisors (27611830).

28049984 is an equidigital number, since it uses as much as digits as its factorization.

28049984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 438293 (or 438283 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 44.

The square root of 28049984 is about 5296.2235602361. The cubic root of 28049984 is about 303.8394812778.

The spelling of 28049984 in words is "twenty-eight million, forty-nine thousand, nine hundred eighty-four".