28443191 has 8 divisors (see below), whose sum is σ = 32626080. Its totient is φ = 24290208.

The previous prime is 28443119. The next prime is 28443197. The reversal of 28443191 is 19134482.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28443191 is a prime.

It is a super-2 number, since 2×28443191² = 1618030228524962, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28443197) 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, 5396 + ... + 9273.

It is an arithmetic number, because the mean of its divisors is an integer number (4078260).

Almost surely, 2^28443191 is an apocalyptic number.

28443191 is a deficient number, since it is larger than the sum of its proper divisors (4182889).

28443191 is a wasteful number, since it uses less digits than its factorization.

28443191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14953.

The product of its digits is 6912, while the sum is 32.

The square root of 28443191 is about 5333.2158216221. The cubic root of 28443191 is about 305.2526474201.

The spelling of 28443191 in words is "twenty-eight million, four hundred forty-three thousand, one hundred ninety-one".