28209032105 has 8 divisors (see below), whose sum is σ = 35018109000. Its totient is φ = 21789045376.

The previous prime is 28209032083. The next prime is 28209032123. The reversal of 28209032105 is 50123090282.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 7984494736 + 20224537369 = 89356^2 + 142213^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28209032105 - 2⁶ = 28209032041 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 97272380 + ... + 97272669.

It is an arithmetic number, because the mean of its divisors is an integer number (4377263625).

Almost surely, 2^28209032105 is an apocalyptic number.

It is an amenable number.

28209032105 is a deficient number, since it is larger than the sum of its proper divisors (6809076895).

28209032105 is a wasteful number, since it uses less digits than its factorization.

28209032105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 194545083.

The product of its (nonzero) digits is 8640, while the sum is 32.

The spelling of 28209032105 in words is "twenty-eight billion, two hundred nine million, thirty-two thousand, one hundred five".