28439266 has 8 divisors (see below), whose sum is σ = 45168300. Its totient is φ = 13383168.

The previous prime is 28439251. The next prime is 28439269. The reversal of 28439266 is 66293482.

It can be written as a sum of positive squares in 2 ways, for example, as 24216241 + 4223025 = 4921^2 + 2055^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (28439269) 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, 418191 + ... + 418258.

Almost surely, 2^28439266 is an apocalyptic number.

28439266 is a deficient number, since it is larger than the sum of its proper divisors (16729034).

28439266 is a wasteful number, since it uses less digits than its factorization.

28439266 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 836468.

The product of its digits is 124416, while the sum is 40.

The square root of 28439266 is about 5332.8478320687. The cubic root of 28439266 is about 305.2386057261.

The spelling of 28439266 in words is "twenty-eight million, four hundred thirty-nine thousand, two hundred sixty-six".