28173887 has 8 divisors (see below), whose sum is σ = 32727072. Its totient is φ = 23752800.

The previous prime is 28173883. The next prime is 28173889. The reversal of 28173887 is 78837182.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28173887 - 2² = 28173883 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28173883) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 32564 + ... + 33417.

It is an arithmetic number, because the mean of its divisors is an integer number (4090884).

Almost surely, 2^28173887 is an apocalyptic number.

28173887 is a deficient number, since it is larger than the sum of its proper divisors (4553185).

28173887 is an equidigital number, since it uses as much as digits as its factorization.

28173887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66049.

The product of its digits is 150528, while the sum is 44.

The square root of 28173887 is about 5307.9079683054. The cubic root of 28173887 is about 304.2861996279.

The spelling of 28173887 in words is "twenty-eight million, one hundred seventy-three thousand, eight hundred eighty-seven".