18273664 has 32 divisors (see below), whose sum is σ = 36597600. Its totient is φ = 9088512.

The previous prime is 18273637. The next prime is 18273679. The reversal of 18273664 is 46637281.

It is a tau number, because it is divible by the number of its divisors (32).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46782 + ... + 47170.

It is an arithmetic number, because the mean of its divisors is an integer number (1143675).

Almost surely, 2^18273664 is an apocalyptic number.

It is an amenable number.

18273664 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

18273664 is an equidigital number, since it uses as much as digits as its factorization.

18273664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 770 (or 758 counting only the distinct ones).

The product of its digits is 48384, while the sum is 37.

The square root of 18273664 is about 4274.7706371219. The cubic root of 18273664 is about 263.3956177335.

The spelling of 18273664 in words is "eighteen million, two hundred seventy-three thousand, six hundred sixty-four".