28811018 has 4 divisors (see below), whose sum is σ = 43216530. Its totient is φ = 14405508.

The previous prime is 28810993. The next prime is 28811023. The reversal of 28811018 is 81011882.

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., 28697449 + 113569 = 5357^2 + 337^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7202753 + ... + 7202756.

Almost surely, 2^28811018 is an apocalyptic number.

28811018 is a deficient number, since it is larger than the sum of its proper divisors (14405512).

28811018 is a wasteful number, since it uses less digits than its factorization.

28811018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14405511.

The product of its (nonzero) digits is 1024, while the sum is 29.

The square root of 28811018 is about 5367.5895893781. The cubic root of 28811018 is about 306.5628568503.

The spelling of 28811018 in words is "twenty-eight million, eight hundred eleven thousand, eighteen".