28131194 has 48 divisors (see below), whose sum is σ = 53778816. Its totient is φ = 10936800.

The previous prime is 28131179. The next prime is 28131199. The reversal of 28131194 is 49113182.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28131199) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 90299 + ... + 90609.

It is an arithmetic number, because the mean of its divisors is an integer number (1120392).

Almost surely, 2^28131194 is an apocalyptic number.

28131194 is a deficient number, since it is larger than the sum of its proper divisors (25647622).

28131194 is a wasteful number, since it uses less digits than its factorization.

28131194 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 411 (or 404 counting only the distinct ones).

The product of its digits is 1728, while the sum is 29.

The square root of 28131194 is about 5303.8848026706. The cubic root of 28131194 is about 304.1324229751.

The spelling of 28131194 in words is "twenty-eight million, one hundred thirty-one thousand, one hundred ninety-four".