28111110012 has 72 divisors (see below), whose sum is σ = 71311946160. Its totient is φ = 9337040640.

The previous prime is 28111109987. The next prime is 28111110023. The reversal of 28111110012 is 21001111182.

It is a super-2 number, since 2×28111110012² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 16333312 + ... + 16335032.

Almost surely, 2^28111110012 is an apocalyptic number.

It is an amenable number.

28111110012 is an abundant number, since it is smaller than the sum of its proper divisors (43200836148).

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

28111110012 is a wasteful number, since it uses less digits than its factorization.

28111110012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3083 (or 3078 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 18.

Adding to 28111110012 its reverse (21001111182), we get a palindrome (49112221194).

The spelling of 28111110012 in words is "twenty-eight billion, one hundred eleven million, one hundred ten thousand, twelve".