28140906 has 16 divisors (see below), whose sum is σ = 56995200. Its totient is φ = 9261408.

The previous prime is 28140887. The next prime is 28140907. The reversal of 28140906 is 60904182.

It is not an unprimeable number, because it can be changed into a prime (28140907) 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, 29211 + ... + 30158.

It is an arithmetic number, because the mean of its divisors is an integer number (3562200).

Almost surely, 2^28140906 is an apocalyptic number.

28140906 is an abundant number, since it is smaller than the sum of its proper divisors (28854294).

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

28140906 is a wasteful number, since it uses less digits than its factorization.

28140906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59453.

The product of its (nonzero) digits is 3456, while the sum is 30.

The square root of 28140906 is about 5304.8002789926. The cubic root of 28140906 is about 304.1674184590.

The spelling of 28140906 in words is "twenty-eight million, one hundred forty thousand, nine hundred six".