28272917 has 4 divisors (see below), whose sum is σ = 28337760. Its totient is φ = 28208076.

The previous prime is 28272889. The next prime is 28272929. The reversal of 28272917 is 71927282.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 28272917 - 2⁸ = 28272661 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 (28272947) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31763 + ... + 32640.

It is an arithmetic number, because the mean of its divisors is an integer number (7084440).

Almost surely, 2^28272917 is an apocalyptic number.

It is an amenable number.

28272917 is a deficient number, since it is larger than the sum of its proper divisors (64843).

28272917 is an equidigital number, since it uses as much as digits as its factorization.

28272917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64842.

The product of its digits is 28224, while the sum is 38.

The square root of 28272917 is about 5317.2283193408. The cubic root of 28272917 is about 304.6423003580.

The spelling of 28272917 in words is "twenty-eight million, two hundred seventy-two thousand, nine hundred seventeen".