28100106 has 12 divisors (see below), whose sum is σ = 60883602. Its totient is φ = 9366696.

The previous prime is 28100041. The next prime is 28100141. The reversal of 28100106 is 60100182.

It can be written as a sum of positive squares in only one way, i.e., 27468081 + 632025 = 5241^2 + 795^2 .

It is a super-2 number, since 2×28100106² = 1579231914422472, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18), and also a Moran number because the ratio is a prime number: 1561117 = 28100106 / (2 + 8 + 1 + 0 + 0 + 1 + 0 + 6).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 780541 + ... + 780576.

Almost surely, 2^28100106 is an apocalyptic number.

28100106 is an abundant number, since it is smaller than the sum of its proper divisors (32783496).

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

28100106 is a wasteful number, since it uses less digits than its factorization.

28100106 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1561125 (or 1561122 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

The square root of 28100106 is about 5300.9533104905. The cubic root of 28100106 is about 304.0203486494.

Adding to 28100106 its reverse (60100182), we get a palindrome (88200288).

The spelling of 28100106 in words is "twenty-eight million, one hundred thousand, one hundred six".