28119191 has 4 divisors (see below), whose sum is σ = 28129800. Its totient is φ = 28108584.

The previous prime is 28119151. The next prime is 28119199. The reversal of 28119191 is 19191182.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 28119191 - 2⁶ = 28119127 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28119199) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2480 + ... + 7898.

It is an arithmetic number, because the mean of its divisors is an integer number (7032450).

Almost surely, 2^28119191 is an apocalyptic number.

28119191 is a deficient number, since it is larger than the sum of its proper divisors (10609).

28119191 is an equidigital number, since it uses as much as digits as its factorization.

28119191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10608.

The product of its digits is 1296, while the sum is 32.

The square root of 28119191 is about 5302.7531528443. The cubic root of 28119191 is about 304.0891611451.

The spelling of 28119191 in words is "twenty-eight million, one hundred nineteen thousand, one hundred ninety-one".