28556775 has 54 divisors (see below), whose sum is σ = 55459248. Its totient is φ = 14040000.

The previous prime is 28556747. The next prime is 28556779. The reversal of 28556775 is 57765582.

28556775 is a `hidden beast` number, since 2 + 85 + 567 + 7 + 5 = 666.

It is not a de Polignac number, because 28556775 - 2⁵ = 28556743 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 28556775.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28556779) by changing a digit.

It is a polite number, since it can be written in 53 ways as a sum of consecutive naturals, for example, 37650 + ... + 38400.

Almost surely, 2^28556775 is an apocalyptic number.

28556775 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28556775 is a deficient number, since it is larger than the sum of its proper divisors (26902473).

28556775 is a wasteful number, since it uses less digits than its factorization.

28556775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 793 (or 772 counting only the distinct ones).

The product of its digits is 588000, while the sum is 45.

The square root of 28556775 is about 5343.8539463574. The cubic root of 28556775 is about 305.6584360022.

The spelling of 28556775 in words is "twenty-eight million, five hundred fifty-six thousand, seven hundred seventy-five".