28319708205 has 48 divisors (see below), whose sum is σ = 49314859776. Its totient is φ = 15034037760.

The previous prime is 28319708191. The next prime is 28319708267. The reversal of 28319708205 is 50280791382.

It is a happy number.

It is not a de Polignac number, because 28319708205 - 2⁹ = 28319707693 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 18234709 + ... + 18236261.

It is an arithmetic number, because the mean of its divisors is an integer number (1027392912).

Almost surely, 2^28319708205 is an apocalyptic number.

It is an amenable number.

28319708205 is a deficient number, since it is larger than the sum of its proper divisors (20995151571).

28319708205 is a wasteful number, since it uses less digits than its factorization.

28319708205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3178 (or 3175 counting only the distinct ones).

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

The spelling of 28319708205 in words is "twenty-eight billion, three hundred nineteen million, seven hundred eight thousand, two hundred five".