28191383 has 8 divisors (see below), whose sum is σ = 32373120. Its totient is φ = 24279480.

The previous prime is 28191379. The next prime is 28191403. The reversal of 28191383 is 38319182.

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

It is a cyclic number.

It is not a de Polignac number, because 28191383 - 2² = 28191379 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 (28191323) 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, 67235 + ... + 67652.

It is an arithmetic number, because the mean of its divisors is an integer number (4046640).

Almost surely, 2^28191383 is an apocalyptic number.

28191383 is a deficient number, since it is larger than the sum of its proper divisors (4181737).

28191383 is a wasteful number, since it uses less digits than its factorization.

28191383 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134917.

The product of its digits is 10368, while the sum is 35.

The square root of 28191383 is about 5309.5558194636. Note that the first 3 decimals coincide. The cubic root of 28191383 is about 304.3491738955.

The spelling of 28191383 in words is "twenty-eight million, one hundred ninety-one thousand, three hundred eighty-three".