28727889 has 16 divisors (see below), whose sum is σ = 39193920. Its totient is φ = 18711360.

The previous prime is 28727887. The next prime is 28727899. The reversal of 28727889 is 98872782.

It is a happy number.

It is not a de Polignac number, because 28727889 - 2¹ = 28727887 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28727887) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32319 + ... + 33195.

It is an arithmetic number, because the mean of its divisors is an integer number (2449620).

Almost surely, 2^28727889 is an apocalyptic number.

It is an amenable number.

28727889 is a deficient number, since it is larger than the sum of its proper divisors (10466031).

28727889 is a wasteful number, since it uses less digits than its factorization.

28727889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1120.

The product of its digits is 903168, while the sum is 51.

The square root of 28727889 is about 5359.8403894146. The cubic root of 28727889 is about 306.2677288640.

The spelling of 28727889 in words is "twenty-eight million, seven hundred twenty-seven thousand, eight hundred eighty-nine".