28709018 has 8 divisors (see below), whose sum is σ = 46376148. Its totient is φ = 13250304.

The previous prime is 28709017. The next prime is 28709029. The reversal of 28709018 is 81090782.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 22915369 + 5793649 = 4787^2 + 2407^2 .

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

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28709011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 552071 + ... + 552122.

Almost surely, 2^28709018 is an apocalyptic number.

28709018 is a deficient number, since it is larger than the sum of its proper divisors (17667130).

28709018 is a wasteful number, since it uses less digits than its factorization.

28709018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1104208.

The product of its (nonzero) digits is 8064, while the sum is 35.

The square root of 28709018 is about 5358.0796933230. The cubic root of 28709018 is about 306.2006529958.

The spelling of 28709018 in words is "twenty-eight million, seven hundred nine thousand, eighteen".