28224306 has 24 divisors (see below), whose sum is σ = 66712464. Its totient is φ = 8552760.

The previous prime is 28224293. The next prime is 28224307. The reversal of 28224306 is 60342282.

It is a super-2 number, since 2×28224306² = 1593222898363272, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 28224306.

It is not an unprimeable number, because it can be changed into a prime (28224307) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 71076 + ... + 71471.

It is an arithmetic number, because the mean of its divisors is an integer number (2779686).

Almost surely, 2^28224306 is an apocalyptic number.

28224306 is an abundant number, since it is smaller than the sum of its proper divisors (38488158).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28224306 is a wasteful number, since it uses less digits than its factorization.

28224306 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142566 (or 142563 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 27.

The square root of 28224306 is about 5312.6552683192. The cubic root of 28224306 is about 304.4676047622.

Adding to 28224306 its reverse (60342282), we get a palindrome (88566588).

The spelling of 28224306 in words is "twenty-eight million, two hundred twenty-four thousand, three hundred six".