28195191 has 6 divisors (see below), whose sum is σ = 40726400. Its totient is φ = 18796788.

The previous prime is 28195133. The next prime is 28195201. The reversal of 28195191 is 19159182.

It is not a de Polignac number, because 28195191 - 2⁶ = 28195127 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 (28195091) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1566391 + ... + 1566408.

Almost surely, 2^28195191 is an apocalyptic number.

28195191 is a deficient number, since it is larger than the sum of its proper divisors (12531209).

28195191 is a wasteful number, since it uses less digits than its factorization.

28195191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3132805 (or 3132802 counting only the distinct ones).

The product of its digits is 6480, while the sum is 36.

The square root of 28195191 is about 5309.9144060898. The cubic root of 28195191 is about 304.3628767763.

The spelling of 28195191 in words is "twenty-eight million, one hundred ninety-five thousand, one hundred ninety-one".