28107102209 has 12 divisors (see below), whose sum is σ = 29519792640. Its totient is φ = 26755611120.

The previous prime is 28107102169. The next prime is 28107102223. The reversal of 28107102209 is 90220170182.

It is a happy number.

It is not a de Polignac number, because 28107102209 - 2¹² = 28107098113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28107102109) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 175649 + ... + 295070.

It is an arithmetic number, because the mean of its divisors is an integer number (2459982720).

Almost surely, 2^28107102209 is an apocalyptic number.

28107102209 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

28107102209 is a deficient number, since it is larger than the sum of its proper divisors (1412690431).

28107102209 is an equidigital number, since it uses as much as digits as its factorization.

28107102209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 470848 (or 470819 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 32.

The spelling of 28107102209 in words is "twenty-eight billion, one hundred seven million, one hundred two thousand, two hundred nine".