28018318 has 4 divisors (see below), whose sum is σ = 42027480. Its totient is φ = 14009158.

The previous prime is 28018307. The next prime is 28018343. The reversal of 28018318 is 81381082.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 81381082 = 2 ⋅40690541.

It is a super-2 number, since 2×28018318² = 1570052287098248, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 28018318.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 7004578 + ... + 7004581.

It is an arithmetic number, because the mean of its divisors is an integer number (10506870).

Almost surely, 2^28018318 is an apocalyptic number.

28018318 is a deficient number, since it is larger than the sum of its proper divisors (14009162).

28018318 is a wasteful number, since it uses less digits than its factorization.

28018318 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14009161.

The product of its (nonzero) digits is 3072, while the sum is 31.

The square root of 28018318 is about 5293.2332274329. The cubic root of 28018318 is about 303.7251020818.

The spelling of 28018318 in words is "twenty-eight million, eighteen thousand, three hundred eighteen".