28728905889 has 16 divisors (see below), whose sum is σ = 38361500352. Its totient is φ = 19124484288.

The previous prime is 28728905879. The next prime is 28728905893. The reversal of 28728905889 is 98850982782.

It is not a de Polignac number, because 28728905889 - 2⁴ = 28728905873 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28728905879) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9081222 + ... + 9084384.

It is an arithmetic number, because the mean of its divisors is an integer number (2397593772).

Almost surely, 2^28728905889 is an apocalyptic number.

It is an amenable number.

28728905889 is a deficient number, since it is larger than the sum of its proper divisors (9632594463).

28728905889 is a wasteful number, since it uses less digits than its factorization.

28728905889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6656.

The product of its (nonzero) digits is 46448640, while the sum is 66.

The spelling of 28728905889 in words is "twenty-eight billion, seven hundred twenty-eight million, nine hundred five thousand, eight hundred eighty-nine".