28109256 has 32 divisors (see below), whose sum is σ = 80312640. Its totient is φ = 8031168.

The previous prime is 28109251. The next prime is 28109299. The reversal of 28109256 is 65290182.

It is not an unprimeable number, because it can be changed into a prime (28109251) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 83491 + ... + 83826.

It is an arithmetic number, because the mean of its divisors is an integer number (2509770).

Almost surely, 2^28109256 is an apocalyptic number.

It is an amenable number.

28109256 is an abundant number, since it is smaller than the sum of its proper divisors (52203384).

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

28109256 is a wasteful number, since it uses less digits than its factorization.

28109256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167333 (or 167329 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 33.

The square root of 28109256 is about 5301.8162925548. The cubic root of 28109256 is about 304.0533435939.

The spelling of 28109256 in words is "twenty-eight million, one hundred nine thousand, two hundred fifty-six".