209999028606 has 32 divisors (see below), whose sum is σ = 440432566560. Its totient is φ = 66660056064.

The previous prime is 209999028599. The next prime is 209999028623. The reversal of 209999028606 is 606820999902.

It is a self number, because there is not a number n which added to its sum of digits gives 209999028606.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8253675 + ... + 8279078.

It is an arithmetic number, because the mean of its divisors is an integer number (13763517705).

Almost surely, 2^209999028606 is an apocalyptic number.

209999028606 is an abundant number, since it is smaller than the sum of its proper divisors (230433537954).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

209999028606 is a wasteful number, since it uses less digits than its factorization.

209999028606 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16532860.

The product of its (nonzero) digits is 7558272, while the sum is 60.

The spelling of 209999028606 in words is "two hundred nine billion, nine hundred ninety-nine million, twenty-eight thousand, six hundred six".