28725789 has 16 divisors (see below), whose sum is σ = 40078080. Its totient is φ = 18282240.

The previous prime is 28725779. The next prime is 28725791. The reversal of 28725789 is 98752782.

It is not a de Polignac number, because 28725789 - 2¹³ = 28717597 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28725709) 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, 3297 + ... + 8265.

It is an arithmetic number, because the mean of its divisors is an integer number (2504880).

Almost surely, 2^28725789 is an apocalyptic number.

It is an amenable number.

28725789 is a deficient number, since it is larger than the sum of its proper divisors (11352291).

28725789 is a wasteful number, since it uses less digits than its factorization.

28725789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5060.

The product of its digits is 564480, while the sum is 48.

The square root of 28725789 is about 5359.6444844784. The cubic root of 28725789 is about 306.2602659893.

The spelling of 28725789 in words is "twenty-eight million, seven hundred twenty-five thousand, seven hundred eighty-nine".