28728901289 has 16 divisors (see below), whose sum is σ = 31781306880. Its totient is φ = 25750200960.

The previous prime is 28728901261. The next prime is 28728901309. The reversal of 28728901289 is 98210982782.

It is a de Polignac number, because none of the positive numbers 2^k-28728901289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28728901889) 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, 3309647 + ... + 3318315.

It is an arithmetic number, because the mean of its divisors is an integer number (1986331680).

Almost surely, 2^28728901289 is an apocalyptic number.

It is an amenable number.

28728901289 is a deficient number, since it is larger than the sum of its proper divisors (3052405591).

28728901289 is a wasteful number, since it uses less digits than its factorization.

28728901289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12880.

The product of its (nonzero) digits is 2322432, while the sum is 56.

The spelling of 28728901289 in words is "twenty-eight billion, seven hundred twenty-eight million, nine hundred one thousand, two hundred eighty-nine".