28840191 has 8 divisors (see below), whose sum is σ = 38522544. Its totient is φ = 19192320.

The previous prime is 28840153. The next prime is 28840193. The reversal of 28840191 is 19104882.

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

It is not a de Polignac number, because 28840191 - 2⁶ = 28840127 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28840193) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6600 + ... + 10061.

It is an arithmetic number, because the mean of its divisors is an integer number (4815318).

Almost surely, 2^28840191 is an apocalyptic number.

28840191 is a deficient number, since it is larger than the sum of its proper divisors (9682353).

28840191 is a wasteful number, since it uses less digits than its factorization.

28840191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17241.

The product of its (nonzero) digits is 4608, while the sum is 33.

The square root of 28840191 is about 5370.3064158389. The cubic root of 28840191 is about 306.6662934516. Note that the first 3 decimals are identical.

The spelling of 28840191 in words is "twenty-eight million, eight hundred forty thousand, one hundred ninety-one".