28109208573 has 32 divisors (see below), whose sum is σ = 42723112320. Its totient is φ = 18254920320.

The previous prime is 28109208571. The next prime is 28109208601. The reversal of 28109208573 is 37580290182.

It is a happy number.

It is not a de Polignac number, because 28109208573 - 2¹ = 28109208571 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28109208571) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 730686 + ... + 768192.

It is an arithmetic number, because the mean of its divisors is an integer number (1335097260).

Almost surely, 2^28109208573 is an apocalyptic number.

It is an amenable number.

28109208573 is a deficient number, since it is larger than the sum of its proper divisors (14613903747).

28109208573 is a wasteful number, since it uses less digits than its factorization.

28109208573 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38234 (or 38228 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 45.

The spelling of 28109208573 in words is "twenty-eight billion, one hundred nine million, two hundred eight thousand, five hundred seventy-three".