18256808 has 16 divisors (see below), whose sum is σ = 35067060. Its totient is φ = 8905600.

The previous prime is 18256801. The next prime is 18256813. The reversal of 18256808 is 80865281.

It can be written as a sum of positive squares in 2 ways, for example, as 15507844 + 2748964 = 3938^2 + 1658^2 .

It is a super-2 number, since 2×18256808² = 666622076697728, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18256801) 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, 27503 + ... + 28158.

Almost surely, 2^18256808 is an apocalyptic number.

It is an amenable number.

18256808 is a deficient number, since it is larger than the sum of its proper divisors (16810252).

18256808 is a wasteful number, since it uses less digits than its factorization.

18256808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55708 (or 55704 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 38.

The square root of 18256808 is about 4272.7986144914. The cubic root of 18256808 is about 263.3146056578.

The spelling of 18256808 in words is "eighteen million, two hundred fifty-six thousand, eight hundred eight".