28056755 has 4 divisors (see below), whose sum is σ = 33668112. Its totient is φ = 22445400.

The previous prime is 28056727. The next prime is 28056773. The reversal of 28056755 is 55765082.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 28056755 - 2¹⁶ = 27991219 is a prime.

It is a super-2 number, since 2×28056755² = 1574363002260050, which contains 22 as substring.

It is a Duffinian number.

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, 2805671 + ... + 2805680.

It is an arithmetic number, because the mean of its divisors is an integer number (8417028).

Almost surely, 2^28056755 is an apocalyptic number.

28056755 is a deficient number, since it is larger than the sum of its proper divisors (5611357).

28056755 is an equidigital number, since it uses as much as digits as its factorization.

28056755 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5611356.

The product of its (nonzero) digits is 84000, while the sum is 38.

The square root of 28056755 is about 5296.8627507233. The cubic root of 28056755 is about 303.8639273002.

The spelling of 28056755 in words is "twenty-eight million, fifty-six thousand, seven hundred fifty-five".