28255775 has 12 divisors (see below), whose sum is σ = 35191200. Its totient is φ = 22505280.

The previous prime is 28255757. The next prime is 28255807. The reversal of 28255775 is 57755282.

It is not a de Polignac number, because 28255775 - 2¹⁴ = 28239391 is a prime.

It is a hoax number, since the sum of its digits (41) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3611 + ... + 8339.

It is an arithmetic number, because the mean of its divisors is an integer number (2932600).

Almost surely, 2^28255775 is an apocalyptic number.

28255775 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28255775 is a deficient number, since it is larger than the sum of its proper divisors (6935425).

28255775 is a wasteful number, since it uses less digits than its factorization.

28255775 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4978 (or 4973 counting only the distinct ones).

The product of its digits is 196000, while the sum is 41.

The square root of 28255775 is about 5315.6161449074. The cubic root of 28255775 is about 304.5807192333.

The spelling of 28255775 in words is "twenty-eight million, two hundred fifty-five thousand, seven hundred seventy-five".