28217353 has 4 divisors (see below), whose sum is σ = 28258308. Its totient is φ = 28176400.

The previous prime is 28217327. The next prime is 28217363. The reversal of 28217353 is 35371282.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 35371282 = 2 ⋅17685641.

It can be written as a sum of positive squares in 2 ways, for example, as 24324624 + 3892729 = 4932^2 + 1973^2 .

It is a cyclic number.

It is not a de Polignac number, because 28217353 - 2¹⁷ = 28086281 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28217363) 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, 19426 + ... + 20827.

It is an arithmetic number, because the mean of its divisors is an integer number (7064577).

Almost surely, 2^28217353 is an apocalyptic number.

It is an amenable number.

28217353 is a deficient number, since it is larger than the sum of its proper divisors (40955).

28217353 is an equidigital number, since it uses as much as digits as its factorization.

28217353 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40954.

The product of its digits is 10080, while the sum is 31.

The square root of 28217353 is about 5312.0008471385. Note that the first 3 decimals coincide. The cubic root of 28217353 is about 304.4426010519.

The spelling of 28217353 in words is "twenty-eight million, two hundred seventeen thousand, three hundred fifty-three".