28554191 has 4 divisors (see below), whose sum is σ = 28573272. Its totient is φ = 28535112.

The previous prime is 28554179. The next prime is 28554199. The reversal of 28554191 is 19145582.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28554191 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 (28554199) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7085 + ... + 10358.

It is an arithmetic number, because the mean of its divisors is an integer number (7143318).

Almost surely, 2^28554191 is an apocalyptic number.

28554191 is a deficient number, since it is larger than the sum of its proper divisors (19081).

28554191 is a wasteful number, since it uses less digits than its factorization.

28554191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19080.

The product of its digits is 14400, while the sum is 35.

The square root of 28554191 is about 5343.6121678131. The cubic root of 28554191 is about 305.6492164127.

The spelling of 28554191 in words is "twenty-eight million, five hundred fifty-four thousand, one hundred ninety-one".