28211197 has 8 divisors (see below), whose sum is σ = 32384000. Its totient is φ = 24074064.

The previous prime is 28211191. The next prime is 28211201. The reversal of 28211197 is 79111282.

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

It is not a de Polignac number, because 28211197 - 2¹¹ = 28209149 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 (28211191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7197 + ... + 10402.

It is an arithmetic number, because the mean of its divisors is an integer number (4048000).

Almost surely, 2^28211197 is an apocalyptic number.

It is an amenable number.

28211197 is a deficient number, since it is larger than the sum of its proper divisors (4172803).

28211197 is a wasteful number, since it uses less digits than its factorization.

28211197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17835.

The product of its digits is 2016, while the sum is 31.

The square root of 28211197 is about 5311.4213728530. The cubic root of 28211197 is about 304.4204600079.

The spelling of 28211197 in words is "twenty-eight million, two hundred eleven thousand, one hundred ninety-seven".