18226664 has 16 divisors (see below), whose sum is σ = 34248420. Its totient is φ = 9093760.

The previous prime is 18226661. The next prime is 18226679. The reversal of 18226664 is 46662281.

It can be written as a sum of positive squares in 2 ways, for example, as 18130564 + 96100 = 4258^2 + 310^2 .

It is a super-2 number, since 2×18226664² = 664422561137792, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18226661) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1982 + ... + 6354.

Almost surely, 2^18226664 is an apocalyptic number.

It is an amenable number.

18226664 is a deficient number, since it is larger than the sum of its proper divisors (16021756).

18226664 is a wasteful number, since it uses less digits than its factorization.

18226664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4900 (or 4896 counting only the distinct ones).

The product of its digits is 27648, while the sum is 35.

The square root of 18226664 is about 4269.2697267800. The cubic root of 18226664 is about 263.1696053568.

The spelling of 18226664 in words is "eighteen million, two hundred twenty-six thousand, six hundred sixty-four".