28181193 has 8 divisors (see below), whose sum is σ = 37614528. Its totient is φ = 18767664.

The previous prime is 28181177. The next prime is 28181203. The reversal of 28181193 is 39118182.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28181193 - 2⁴ = 28181177 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28181143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1230 + ... + 7607.

It is an arithmetic number, because the mean of its divisors is an integer number (4701816).

Almost surely, 2^28181193 is an apocalyptic number.

It is an amenable number.

28181193 is a deficient number, since it is larger than the sum of its proper divisors (9433335).

28181193 is a wasteful number, since it uses less digits than its factorization.

28181193 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9903.

The product of its digits is 3456, while the sum is 33.

The square root of 28181193 is about 5308.5961421076. The cubic root of 28181193 is about 304.3124996652.

The spelling of 28181193 in words is "twenty-eight million, one hundred eighty-one thousand, one hundred ninety-three".