18361664 has 28 divisors (see below), whose sum is σ = 36601908. Its totient is φ = 9139200.

The previous prime is 18361661. The next prime is 18361667. The reversal of 18361664 is 46616381.

It is an interprime number because it is at equal distance from previous prime (18361661) and next prime (18361667).

It can be written as a sum of positive squares in 2 ways, for example, as 11560000 + 6801664 = 3400^2 + 2608^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18361661) 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, 17474 + ... + 18494.

It is an arithmetic number, because the mean of its divisors is an integer number (1307211).

Almost surely, 2^18361664 is an apocalyptic number.

It is an amenable number.

18361664 is a deficient number, since it is larger than the sum of its proper divisors (18240244).

18361664 is a wasteful number, since it uses less digits than its factorization.

18361664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1314 (or 1304 counting only the distinct ones).

The product of its digits is 20736, while the sum is 35.

The square root of 18361664 is about 4285.0512248980. The cubic root of 18361664 is about 263.8177499412.

The spelling of 18361664 in words is "eighteen million, three hundred sixty-one thousand, six hundred sixty-four".