28217236 has 12 divisors (see below), whose sum is σ = 50715028. Its totient is φ = 13727232.

The previous prime is 28217227. The next prime is 28217239. The reversal of 28217236 is 63271282.

It can be written as a sum of positive squares in 2 ways, for example, as 10627600 + 17589636 = 3260^2 + 4194^2 .

It is a junction number, because it is equal to n+sod(n) for n = 28217198 and 28217207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28217239) 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, 95181 + ... + 95476.

Almost surely, 2^28217236 is an apocalyptic number.

It is an amenable number.

28217236 is a deficient number, since it is larger than the sum of its proper divisors (22497792).

28217236 is a wasteful number, since it uses less digits than its factorization.

28217236 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 190698 (or 190696 counting only the distinct ones).

The product of its digits is 8064, while the sum is 31.

The square root of 28217236 is about 5311.9898343276. The cubic root of 28217236 is about 304.4421802726.

The spelling of 28217236 in words is "twenty-eight million, two hundred seventeen thousand, two hundred thirty-six".