28800018 has 24 divisors (see below), whose sum is σ = 67200588. Its totient is φ = 8861472.

The previous prime is 28800011. The next prime is 28800019. The reversal of 28800018 is 81000882.

It can be written as a sum of positive squares in 2 ways, for example, as 27279729 + 1520289 = 5223^2 + 1233^2 .

It is a junction number, because it is equal to n+sod(n) for n = 28799964 and 28800000.

It is not an unprimeable number, because it can be changed into a prime (28800011) 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 in 11 ways as a sum of consecutive naturals, for example, 61305 + ... + 61772.

Almost surely, 2^28800018 is an apocalyptic number.

28800018 is an abundant number, since it is smaller than the sum of its proper divisors (38400570).

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

28800018 is a wasteful number, since it uses less digits than its factorization.

28800018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123098 (or 123095 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 27.

The square root of 28800018 is about 5366.5648230502. The cubic root of 28800018 is about 306.5238368165.

The spelling of 28800018 in words is "twenty-eight million, eight hundred thousand, eighteen".