28028575 has 6 divisors (see below), whose sum is σ = 34755464. Its totient is φ = 22422840.

The previous prime is 28028549. The next prime is 28028593. The reversal of 28028575 is 57582082.

It is not a de Polignac number, because 28028575 - 2⁷ = 28028447 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 560547 + ... + 560596.

Almost surely, 2^28028575 is an apocalyptic number.

28028575 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28028575 is a deficient number, since it is larger than the sum of its proper divisors (6726889).

28028575 is a wasteful number, since it uses less digits than its factorization.

28028575 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1121153 (or 1121148 counting only the distinct ones).

The product of its (nonzero) digits is 44800, while the sum is 37.

The square root of 28028575 is about 5294.2020173016. The cubic root of 28028575 is about 303.7621603175.

The spelling of 28028575 in words is "twenty-eight million, twenty-eight thousand, five hundred seventy-five".