28728127 has 4 divisors (see below), whose sum is σ = 29977200. Its totient is φ = 27479056.

The previous prime is 28728121. The next prime is 28728151. The reversal of 28728127 is 72182782.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28728127 - 2¹¹ = 28726079 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28728121) 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 3 ways as a sum of consecutive naturals, for example, 624502 + ... + 624547.

It is an arithmetic number, because the mean of its divisors is an integer number (7494300).

Almost surely, 2^28728127 is an apocalyptic number.

28728127 is a deficient number, since it is larger than the sum of its proper divisors (1249073).

28728127 is a wasteful number, since it uses less digits than its factorization.

28728127 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1249072.

The product of its digits is 25088, while the sum is 37.

The square root of 28728127 is about 5359.8625915223. The cubic root of 28728127 is about 306.2685746335.

The spelling of 28728127 in words is "twenty-eight million, seven hundred twenty-eight thousand, one hundred twenty-seven".