18764224 has 28 divisors (see below), whose sum is σ = 38148768. Its totient is φ = 9152000.

The previous prime is 18764219. The next prime is 18764237. The reversal of 18764224 is 42246781.

It is a happy number.

It is a super-2 number, since 2×18764224² = 704192204644352, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 18764224.

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, 952 + ... + 6199.

It is an arithmetic number, because the mean of its divisors is an integer number (1362456).

Almost surely, 2^18764224 is an apocalyptic number.

It is an amenable number.

18764224 is an abundant number, since it is smaller than the sum of its proper divisors (19384544).

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

18764224 is an equidigital number, since it uses as much as digits as its factorization.

18764224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7204 (or 7194 counting only the distinct ones).

The product of its digits is 21504, while the sum is 34.

The square root of 18764224 is about 4331.7691535907. The cubic root of 18764224 is about 265.7318042285.

The spelling of 18764224 in words is "eighteen million, seven hundred sixty-four thousand, two hundred twenty-four".