28002191 has 8 divisors (see below), whose sum is σ = 32286624. Its totient is φ = 23788800.

The previous prime is 28002157. The next prime is 28002193. The reversal of 28002191 is 19120082.

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

It is not a de Polignac number, because 28002191 - 2⁶ = 28002127 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 (28002193) 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, 16910 + ... + 18491.

It is an arithmetic number, because the mean of its divisors is an integer number (4035828).

Almost surely, 2^28002191 is an apocalyptic number.

28002191 is a deficient number, since it is larger than the sum of its proper divisors (4284433).

28002191 is a wasteful number, since it uses less digits than its factorization.

28002191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35521.

The product of its (nonzero) digits is 288, while the sum is 23.

The square root of 28002191 is about 5291.7096481194. The cubic root of 28002191 is about 303.6668174172. Note that the first 3 decimals are identical.

The spelling of 28002191 in words is "twenty-eight million, two thousand, one hundred ninety-one".