28198906911 has 12 divisors (see below), whose sum is σ = 46550576592. Its totient is φ = 16113661056.

The previous prime is 28198906909. The next prime is 28198906933. The reversal of 28198906911 is 11960989182.

It is not a de Polignac number, because 28198906911 - 2¹ = 28198906909 is a prime.

It is a hoax number, since the sum of its digits (54) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28198906951) 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, 223800786 + ... + 223800911.

It is an arithmetic number, because the mean of its divisors is an integer number (3879214716).

Almost surely, 2^28198906911 is an apocalyptic number.

28198906911 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

28198906911 is a deficient number, since it is larger than the sum of its proper divisors (18351669681).

28198906911 is a wasteful number, since it uses less digits than its factorization.

28198906911 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 447601710 (or 447601707 counting only the distinct ones).

The product of its (nonzero) digits is 559872, while the sum is 54.

The spelling of 28198906911 in words is "twenty-eight billion, one hundred ninety-eight million, nine hundred six thousand, nine hundred eleven".