28156255 has 8 divisors (see below), whose sum is σ = 35256672. Its totient is φ = 21545568.

The previous prime is 28156241. The next prime is 28156259. The reversal of 28156255 is 55265182.

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 28156255 - 2⁷ = 28156127 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28156255.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28156259) 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, 122304 + ... + 122533.

It is an arithmetic number, because the mean of its divisors is an integer number (4407084).

Almost surely, 2^28156255 is an apocalyptic number.

28156255 is a deficient number, since it is larger than the sum of its proper divisors (7100417).

28156255 is a wasteful number, since it uses less digits than its factorization.

28156255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 244865.

The product of its digits is 24000, while the sum is 34.

The square root of 28156255 is about 5306.2467903406. The cubic root of 28156255 is about 304.2227094666. Note that the first 3 decimals are identical.

The spelling of 28156255 in words is "twenty-eight million, one hundred fifty-six thousand, two hundred fifty-five".