28191713 has 8 divisors (see below), whose sum is σ = 30841536. Its totient is φ = 25556400.

The previous prime is 28191677. The next prime is 28191727. The reversal of 28191713 is 31719182.

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 28191713 - 2¹⁰ = 28190689 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 28191713.

It is not an unprimeable number, because it can be changed into a prime (28191773) 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, 668 + ... + 7538.

It is an arithmetic number, because the mean of its divisors is an integer number (3855192).

Almost surely, 2^28191713 is an apocalyptic number.

It is an amenable number.

28191713 is a deficient number, since it is larger than the sum of its proper divisors (2649823).

28191713 is a wasteful number, since it uses less digits than its factorization.

28191713 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7255.

The product of its digits is 3024, while the sum is 32.

The square root of 28191713 is about 5309.5868954185. The cubic root of 28191713 is about 304.3503614314.

The spelling of 28191713 in words is "twenty-eight million, one hundred ninety-one thousand, seven hundred thirteen".