28879875 has 64 divisors (see below), whose sum is σ = 54912000. Its totient is φ = 14968800.

The previous prime is 28879847. The next prime is 28879883. The reversal of 28879875 is 57897882.

It is a Cunningham number, because it is equal to 5374²-1.

It is not a de Polignac number, because 28879875 - 2⁵ = 28879843 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 145026 + ... + 145224.

It is an arithmetic number, because the mean of its divisors is an integer number (858000).

Almost surely, 2^28879875 is an apocalyptic number.

28879875 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28879875 is a deficient number, since it is larger than the sum of its proper divisors (26032125).

28879875 is a wasteful number, since it uses less digits than its factorization.

28879875 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 266 (or 250 counting only the distinct ones).

The product of its digits is 2257920, while the sum is 54.

The square root of 28879875 is about 5373.9999069594. Note that the first 4 decimals coincide. The cubic root of 28879875 is about 306.8068862284.

The spelling of 28879875 in words is "twenty-eight million, eight hundred seventy-nine thousand, eight hundred seventy-five".