28861875 has 60 divisors (see below), whose sum is σ = 59618416. Its totient is φ = 13176000.

The previous prime is 28861867. The next prime is 28861891. The reversal of 28861875 is 57816882.

28861875 is a `hidden beast` number, since 28 + 8 + 618 + 7 + 5 = 666.

It is not a de Polignac number, because 28861875 - 2³ = 28861867 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28861875.

It is an unprimeable number.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 39009 + ... + 39741.

Almost surely, 2^28861875 is an apocalyptic number.

28861875 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28861875 is an abundant number, since it is smaller than the sum of its proper divisors (30756541).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28861875 is an equidigital number, since it uses as much as digits as its factorization.

28861875 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 766 (or 748 counting only the distinct ones).

The product of its digits is 215040, while the sum is 45.

The square root of 28861875 is about 5372.3249157139. The cubic root of 28861875 is about 306.7431316623.

It can be divided in two parts, 2886 and 1875, that added together give a square (4761 = 69²).

The spelling of 28861875 in words is "twenty-eight million, eight hundred sixty-one thousand, eight hundred seventy-five".