18221064 has 32 divisors (see below), whose sum is σ = 45719520. Its totient is φ = 6051456.

The previous prime is 18221041. The next prime is 18221081. The reversal of 18221064 is 46012281.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6132 + ... + 8604.

It is an arithmetic number, because the mean of its divisors is an integer number (1428735).

Almost surely, 2^18221064 is an apocalyptic number.

It is an amenable number.

18221064 is an abundant number, since it is smaller than the sum of its proper divisors (27498456).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18221064 is a wasteful number, since it uses less digits than its factorization.

18221064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2789 (or 2785 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 24.

The square root of 18221064 is about 4268.6138265250. The cubic root of 18221064 is about 263.1426503282.

The spelling of 18221064 in words is "eighteen million, two hundred twenty-one thousand, sixty-four".