28981875 has 80 divisors (see below), whose sum is σ = 55107360. Its totient is φ = 13440000.

The previous prime is 28981873. The next prime is 28981877. The reversal of 28981875 is 57818982.

It is an interprime number because it is at equal distance from previous prime (28981873) and next prime (28981877).

It is not a de Polignac number, because 28981875 - 2¹ = 28981873 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28981873) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 706855 + ... + 706895.

It is an arithmetic number, because the mean of its divisors is an integer number (688842).

Almost surely, 2^28981875 is an apocalyptic number.

28981875 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28981875 is a deficient number, since it is larger than the sum of its proper divisors (26125485).

28981875 is a wasteful number, since it uses less digits than its factorization.

28981875 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106 (or 91 counting only the distinct ones).

The product of its digits is 322560, while the sum is 48.

The square root of 28981875 is about 5383.4816801026. The cubic root of 28981875 is about 307.1676626287.

The spelling of 28981875 in words is "twenty-eight million, nine hundred eighty-one thousand, eight hundred seventy-five".