28351211111 has 4 divisors (see below), whose sum is σ = 28355514000. Its totient is φ = 28346908224.

The previous prime is 28351211093. The next prime is 28351211137. The reversal of 28351211111 is 11111215382.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28351211111 - 2⁶ = 28351211047 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28351201111) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2141546 + ... + 2154743.

It is an arithmetic number, because the mean of its divisors is an integer number (7088878500).

Almost surely, 2^28351211111 is an apocalyptic number.

28351211111 is a deficient number, since it is larger than the sum of its proper divisors (4302889).

28351211111 is an equidigital number, since it uses as much as digits as its factorization.

28351211111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4302888.

The product of its digits is 480, while the sum is 26.

Adding to 28351211111 its reverse (11111215382), we get a palindrome (39462426493).

The spelling of 28351211111 in words is "twenty-eight billion, three hundred fifty-one million, two hundred eleven thousand, one hundred eleven".