28890875 has 32 divisors (see below), whose sum is σ = 40569984. Its totient is φ = 20380800.

The previous prime is 28890863. The next prime is 28890893. The reversal of 28890875 is 57809882.

It is not a de Polignac number, because 28890875 - 2⁴ = 28890859 is a prime.

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 31 ways as a sum of consecutive naturals, for example, 36989 + ... + 37761.

It is an arithmetic number, because the mean of its divisors is an integer number (1267812).

Almost surely, 2^28890875 is an apocalyptic number.

28890875 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28890875 is a deficient number, since it is larger than the sum of its proper divisors (11679109).

28890875 is a wasteful number, since it uses less digits than its factorization.

28890875 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 824 (or 814 counting only the distinct ones).

The product of its (nonzero) digits is 322560, while the sum is 47.

The square root of 28890875 is about 5375.0232557636. The cubic root of 28890875 is about 306.8458343120.

The spelling of 28890875 in words is "twenty-eight million, eight hundred ninety thousand, eight hundred seventy-five".