28545218 has 8 divisors (see below), whose sum is σ = 46111548. Its totient is φ = 13174704.

The previous prime is 28545211. The next prime is 28545221. The reversal of 28545218 is 81254582.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 28440889 + 104329 = 5333^2 + 323^2 .

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 (28545211) 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, 548921 + ... + 548972.

Almost surely, 2^28545218 is an apocalyptic number.

28545218 is a deficient number, since it is larger than the sum of its proper divisors (17566330).

28545218 is a wasteful number, since it uses less digits than its factorization.

28545218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1097908.

The product of its digits is 25600, while the sum is 35.

The square root of 28545218 is about 5342.7725012394. The cubic root of 28545218 is about 305.6171968544.

The spelling of 28545218 in words is "twenty-eight million, five hundred forty-five thousand, two hundred eighteen".