28817226 has 12 divisors (see below), whose sum is σ = 62437362. Its totient is φ = 9605736.

The previous prime is 28817209. The next prime is 28817231. The reversal of 28817226 is 62271882.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 17264025 + 11553201 = 4155^2 + 3399^2 .

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 800461 + ... + 800496.

Almost surely, 2^28817226 is an apocalyptic number.

28817226 is an abundant number, since it is smaller than the sum of its proper divisors (33620136).

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

28817226 is a wasteful number, since it uses less digits than its factorization.

28817226 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1600965 (or 1600962 counting only the distinct ones).

The product of its digits is 21504, while the sum is 36.

The square root of 28817226 is about 5368.1678438737. The cubic root of 28817226 is about 306.5848739543.

Subtracting 28817226 from its reverse (62271882), we obtain a square (33454656 = 5784²).

The spelling of 28817226 in words is "twenty-eight million, eight hundred seventeen thousand, two hundred twenty-six".