28389813123 has 16 divisors (see below), whose sum is σ = 45141566976. Its totient is φ = 15517413120.

The previous prime is 28389813043. The next prime is 28389813149. The reversal of 28389813123 is 32131898382.

It is a happy number.

It is not a de Polignac number, because 28389813123 - 2²⁴ = 28373035907 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28389817123) 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, 29388558 + ... + 29389523.

It is an arithmetic number, because the mean of its divisors is an integer number (2821347936).

Almost surely, 2^28389813123 is an apocalyptic number.

28389813123 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

28389813123 is a deficient number, since it is larger than the sum of its proper divisors (16751753853).

28389813123 is a wasteful number, since it uses less digits than its factorization.

28389813123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58778114.

The product of its digits is 497664, while the sum is 48.

The spelling of 28389813123 in words is "twenty-eight billion, three hundred eighty-nine million, eight hundred thirteen thousand, one hundred twenty-three".