28055144 has 16 divisors (see below), whose sum is σ = 56650020. Its totient is φ = 12948480.

The previous prime is 28055143. The next prime is 28055201. The reversal of 28055144 is 44155082.

It can be written as a sum of positive squares in 2 ways, for example, as 27352900 + 702244 = 5230^2 + 838^2 .

It is a super-2 number, since 2×28055144² = 1574182209721472, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28055143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 134777 + ... + 134984.

Almost surely, 2^28055144 is an apocalyptic number.

It is an amenable number.

28055144 is an abundant number, since it is smaller than the sum of its proper divisors (28594876).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28055144 is a wasteful number, since it uses less digits than its factorization.

28055144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 269780 (or 269776 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 29.

The square root of 28055144 is about 5296.7106773921. The cubic root of 28055144 is about 303.8581113015.

The spelling of 28055144 in words is "twenty-eight million, fifty-five thousand, one hundred forty-four".