28140106 has 4 divisors (see below), whose sum is σ = 42210162. Its totient is φ = 14070052.

The previous prime is 28140097. The next prime is 28140131. The reversal of 28140106 is 60104182.

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

It can be written as a sum of positive squares in only one way, i.e., 27657081 + 483025 = 5259^2 + 695^2 .

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7035025 + ... + 7035028.

Almost surely, 2^28140106 is an apocalyptic number.

28140106 is a deficient number, since it is larger than the sum of its proper divisors (14070056).

28140106 is a wasteful number, since it uses less digits than its factorization.

28140106 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14070055.

The product of its (nonzero) digits is 384, while the sum is 22.

The square root of 28140106 is about 5304.7248750524. The cubic root of 28140106 is about 304.1645361040.

Adding to 28140106 its reverse (60104182), we get a palindrome (88244288).

The spelling of 28140106 in words is "twenty-eight million, one hundred forty thousand, one hundred six".