28369191 has 4 divisors (see below), whose sum is σ = 37825592. Its totient is φ = 18912792.

The previous prime is 28369181. The next prime is 28369213. The reversal of 28369191 is 19196382.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 28369191 - 2⁶ = 28369127 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 (28369181) 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, 4728196 + ... + 4728201.

It is an arithmetic number, because the mean of its divisors is an integer number (9456398).

Almost surely, 2^28369191 is an apocalyptic number.

28369191 is a deficient number, since it is larger than the sum of its proper divisors (9456401).

28369191 is an equidigital number, since it uses as much as digits as its factorization.

28369191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9456400.

The product of its digits is 23328, while the sum is 39.

The square root of 28369191 is about 5326.2736504990. The cubic root of 28369191 is about 304.9876945676.

The spelling of 28369191 in words is "twenty-eight million, three hundred sixty-nine thousand, one hundred ninety-one".