28364531111 has 4 divisors (see below), whose sum is σ = 32416606992. Its totient is φ = 24312455232.

The previous prime is 28364531089. The next prime is 28364531119. The reversal of 28364531111 is 11113546382.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11113546382 = 2 ⋅5556773191.

It is a cyclic number.

It is not a de Polignac number, because 28364531111 - 2⁶ = 28364531047 is a prime.

It is a super-3 number, since 3×28364531111³ (a number of 32 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28364531119) 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, 2026037930 + ... + 2026037943.

It is an arithmetic number, because the mean of its divisors is an integer number (8104151748).

Almost surely, 2^28364531111 is an apocalyptic number.

28364531111 is a deficient number, since it is larger than the sum of its proper divisors (4052075881).

28364531111 is an equidigital number, since it uses as much as digits as its factorization.

28364531111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4052075880.

The product of its digits is 17280, while the sum is 35.

The spelling of 28364531111 in words is "twenty-eight billion, three hundred sixty-four million, five hundred thirty-one thousand, one hundred eleven".