28138146 has 16 divisors (see below), whose sum is σ = 56524800. Its totient is φ = 9337968.

The previous prime is 28138129. The next prime is 28138147. The reversal of 28138146 is 64183182.

It is a super-3 number, since 3×28138146³ (a number of 23 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (28138147) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8866 + ... + 11613.

It is an arithmetic number, because the mean of its divisors is an integer number (3532800).

Almost surely, 2^28138146 is an apocalyptic number.

28138146 is an abundant number, since it is smaller than the sum of its proper divisors (28386654).

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

28138146 is a wasteful number, since it uses less digits than its factorization.

28138146 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20713.

The product of its digits is 9216, while the sum is 33.

The square root of 28138146 is about 5304.5401308690. The cubic root of 28138146 is about 304.1574741035.

The spelling of 28138146 in words is "twenty-eight million, one hundred thirty-eight thousand, one hundred forty-six".