28139272 has 16 divisors (see below), whose sum is σ = 60298560. Its totient is φ = 12059664.

The previous prime is 28139269. The next prime is 28139297. The reversal of 28139272 is 27293182.

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, 251188 + ... + 251299.

It is an arithmetic number, because the mean of its divisors is an integer number (3768660).

Almost surely, 2^28139272 is an apocalyptic number.

It is an amenable number.

28139272 is an abundant number, since it is smaller than the sum of its proper divisors (32159288).

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

28139272 is a wasteful number, since it uses less digits than its factorization.

28139272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 502500 (or 502496 counting only the distinct ones).

The product of its digits is 12096, while the sum is 34.

The square root of 28139272 is about 5304.6462653037. The cubic root of 28139272 is about 304.1615311908.

The spelling of 28139272 in words is "twenty-eight million, one hundred thirty-nine thousand, two hundred seventy-two".