2220664 has 16 divisors (see below), whose sum is σ = 4195800. Its totient is φ = 1101792.

The previous prime is 2220661. The next prime is 2220671. The reversal of 2220664 is 4660222.

It is a happy number.

It is a d-powerful number, because it can be written as 2⁵ + 2⁷ + 2¹⁹ + 0 + 6³ + 6⁸ + 4⁷ .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2220661) 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, 114 + ... + 2110.

2^2220664 is an apocalyptic number.

It is an amenable number.

2220664 is a deficient number, since it is larger than the sum of its proper divisors (1975136).

2220664 is a wasteful number, since it uses less digits than its factorization.

2220664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2142 (or 2138 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 22.

The square root of 2220664 is about 1490.1892497264. The cubic root of 2220664 is about 130.4650797383.

Adding to 2220664 its reverse (4660222), we get a palindrome (6880886).

The spelling of 2220664 in words is "two million, two hundred twenty thousand, six hundred sixty-four".