28190418 has 16 divisors (see below), whose sum is σ = 57305856. Its totient is φ = 9242640.

The previous prime is 28190389. The next prime is 28190419. The reversal of 28190418 is 81409182.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28190419) 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, 38146 + ... + 38877.

It is an arithmetic number, because the mean of its divisors is an integer number (3581616).

Almost surely, 2^28190418 is an apocalyptic number.

28190418 is an abundant number, since it is smaller than the sum of its proper divisors (29115438).

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

28190418 is a wasteful number, since it uses less digits than its factorization.

28190418 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77089.

The product of its (nonzero) digits is 4608, while the sum is 33.

The square root of 28190418 is about 5309.4649447943. The cubic root of 28190418 is about 304.3457011996.

The spelling of 28190418 in words is "twenty-eight million, one hundred ninety thousand, four hundred eighteen".