28919875 has 8 divisors (see below), whose sum is σ = 36092160. Its totient is φ = 23135800.

The previous prime is 28919867. The next prime is 28919893. The reversal of 28919875 is 57891982.

It is not a de Polignac number, because 28919875 - 2³ = 28919867 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 7 ways as a sum of consecutive naturals, for example, 115555 + ... + 115804.

It is an arithmetic number, because the mean of its divisors is an integer number (4511520).

Almost surely, 2^28919875 is an apocalyptic number.

28919875 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28919875 is a deficient number, since it is larger than the sum of its proper divisors (7172285).

28919875 is an equidigital number, since it uses as much as digits as its factorization.

28919875 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 231374 (or 231364 counting only the distinct ones).

The product of its digits is 362880, while the sum is 49.

The square root of 28919875 is about 5377.7202418869. The cubic root of 28919875 is about 306.9484682575.

It can be divided in two parts, 289 and 19875, that added together give a square (20164 = 142²).

The spelling of 28919875 in words is "twenty-eight million, nine hundred nineteen thousand, eight hundred seventy-five".