2188664 has 16 divisors (see below), whose sum is σ = 4174200. Its totient is φ = 1075552.

The previous prime is 2188663. The next prime is 2188673. The reversal of 2188664 is 4668812.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2188663) 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, 1847 + ... + 2790.

2^2188664 is an apocalyptic number.

It is an amenable number.

2188664 is a deficient number, since it is larger than the sum of its proper divisors (1985536).

2188664 is a wasteful number, since it uses less digits than its factorization.

2188664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4702 (or 4698 counting only the distinct ones).

The product of its digits is 18432, while the sum is 35.

The square root of 2188664 is about 1479.4133972626. The cubic root of 2188664 is about 129.8353734659.

The spelling of 2188664 in words is "two million, one hundred eighty-eight thousand, six hundred sixty-four".