18228656 has 10 divisors (see below), whose sum is σ = 35318052. Its totient is φ = 9114320.

The previous prime is 18228653. The next prime is 18228659. The reversal of 18228656 is 65682281.

It is an interprime number because it is at equal distance from previous prime (18228653) and next prime (18228659).

It is not an unprimeable number, because it can be changed into a prime (18228653) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 569630 + ... + 569661.

Almost surely, 2^18228656 is an apocalyptic number.

18228656 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

18228656 is a deficient number, since it is larger than the sum of its proper divisors (17089396).

18228656 is a wasteful number, since it uses less digits than its factorization.

18228656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1139299 (or 1139293 counting only the distinct ones).

The product of its digits is 46080, while the sum is 38.

The square root of 18228656 is about 4269.5030155745. The cubic root of 18228656 is about 263.1791923142.

The spelling of 18228656 in words is "eighteen million, two hundred twenty-eight thousand, six hundred fifty-six".