28001255 has 8 divisors (see below), whose sum is σ = 33633600. Its totient is φ = 22379616.

The previous prime is 28001251. The next prime is 28001291. The reversal of 28001255 is 55210082.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28001255 - 2² = 28001251 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28001255.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28001251) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5186 + ... + 9104.

It is an arithmetic number, because the mean of its divisors is an integer number (4204200).

Almost surely, 2^28001255 is an apocalyptic number.

28001255 is a deficient number, since it is larger than the sum of its proper divisors (5632345).

28001255 is a wasteful number, since it uses less digits than its factorization.

28001255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5353.

The product of its (nonzero) digits is 800, while the sum is 23.

The square root of 28001255 is about 5291.6212071538. The cubic root of 28001255 is about 303.6634339283.

The spelling of 28001255 in words is "twenty-eight million, one thousand, two hundred fifty-five".