28102005111 has 8 divisors (see below), whose sum is σ = 38761386480. Its totient is φ = 18088646912.

The previous prime is 28102005097. The next prime is 28102005133. The reversal of 28102005111 is 11150020182.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28102005111 - 2¹⁰ = 28102004087 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28102005511) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 161505690 + ... + 161505863.

It is an arithmetic number, because the mean of its divisors is an integer number (4845173310).

Almost surely, 2^28102005111 is an apocalyptic number.

28102005111 is a deficient number, since it is larger than the sum of its proper divisors (10659381369).

28102005111 is a wasteful number, since it uses less digits than its factorization.

28102005111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 323011585.

The product of its (nonzero) digits is 160, while the sum is 21.

Adding to 28102005111 its reverse (11150020182), we get a palindrome (39252025293).

The spelling of 28102005111 in words is "twenty-eight billion, one hundred two million, five thousand, one hundred eleven".