28176889 has 8 divisors (see below), whose sum is σ = 30614472. Its totient is φ = 25777920.

The previous prime is 28176887. The next prime is 28176899. The reversal of 28176889 is 98867182.

It can be written as a sum of positive squares in 4 ways, for example, as 2025 + 28174864 = 45^2 + 5308^2 .

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 28176889 - 2¹ = 28176887 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28176887) 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, 8122 + ... + 11059.

It is an arithmetic number, because the mean of its divisors is an integer number (3826809).

Almost surely, 2^28176889 is an apocalyptic number.

It is an amenable number.

28176889 is a deficient number, since it is larger than the sum of its proper divisors (2437583).

28176889 is a wasteful number, since it uses less digits than its factorization.

28176889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19307.

The product of its digits is 387072, while the sum is 49.

The square root of 28176889 is about 5308.1907463843. The cubic root of 28176889 is about 304.2970067360.

The spelling of 28176889 in words is "twenty-eight million, one hundred seventy-six thousand, eight hundred eighty-nine".