28208266 has 4 divisors (see below), whose sum is σ = 42312402. Its totient is φ = 14104132.

The previous prime is 28208261. The next prime is 28208267. The reversal of 28208266 is 66280282.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 20205025 + 8003241 = 4495^2 + 2829^2 .

It is not an unprimeable number, because it can be changed into a prime (28208261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7052065 + ... + 7052068.

Almost surely, 2^28208266 is an apocalyptic number.

28208266 is a deficient number, since it is larger than the sum of its proper divisors (14104136).

28208266 is a wasteful number, since it uses less digits than its factorization.

28208266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14104135.

The product of its (nonzero) digits is 18432, while the sum is 34.

The square root of 28208266 is about 5311.1454508420. The cubic root of 28208266 is about 304.4099170632.

The spelling of 28208266 in words is "twenty-eight million, two hundred eight thousand, two hundred sixty-six".