28100111029 has 4 divisors (see below), whose sum is σ = 28115819980. Its totient is φ = 28084402080.

The previous prime is 28100111027. The next prime is 28100111033. The reversal of 28100111029 is 92011100182.

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

It can be written as a sum of positive squares in 2 ways, for example, as 21114996100 + 6985114929 = 145310^2 + 83577^2 .

It is a cyclic number.

It is not a de Polignac number, because 28100111029 - 2¹ = 28100111027 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28100110994 and 28100111012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28100111023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7851792 + ... + 7855369.

It is an arithmetic number, because the mean of its divisors is an integer number (7028954995).

Almost surely, 2^28100111029 is an apocalyptic number.

It is an amenable number.

28100111029 is a deficient number, since it is larger than the sum of its proper divisors (15708951).

28100111029 is a wasteful number, since it uses less digits than its factorization.

28100111029 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15708950.

The product of its (nonzero) digits is 288, while the sum is 25.

It can be divided in two parts, 28100 and 111029, that added together give a square (139129 = 373²).

The spelling of 28100111029 in words is "twenty-eight billion, one hundred million, one hundred eleven thousand, twenty-nine".