28889975 has 12 divisors (see below), whose sum is σ = 37709640. Its totient is φ = 21895200.

The previous prime is 28889963. The next prime is 28889989. The reversal of 28889975 is 57998882.

It is not a de Polignac number, because 28889975 - 2⁸ = 28889719 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28889975.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 29936 + ... + 30885.

It is an arithmetic number, because the mean of its divisors is an integer number (3142470).

Almost surely, 2^28889975 is an apocalyptic number.

28889975 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28889975 is a deficient number, since it is larger than the sum of its proper divisors (8819665).

28889975 is a wasteful number, since it uses less digits than its factorization.

28889975 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60850 (or 60845 counting only the distinct ones).

The product of its digits is 2903040, while the sum is 56.

The square root of 28889975 is about 5374.9395345436. The cubic root of 28889975 is about 306.8426480220.

The spelling of 28889975 in words is "twenty-eight million, eight hundred eighty-nine thousand, nine hundred seventy-five".