12220664 has 8 divisors (see below), whose sum is σ = 22913760. Its totient is φ = 6110328.

The previous prime is 12220661. The next prime is 12220669. The reversal of 12220664 is 46602221.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12220661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 763784 + ... + 763799.

It is an arithmetic number, because the mean of its divisors is an integer number (2864220).

Almost surely, 2^12220664 is an apocalyptic number.

It is an amenable number.

12220664 is a deficient number, since it is larger than the sum of its proper divisors (10693096).

12220664 is a wasteful number, since it uses less digits than its factorization.

12220664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1527589 (or 1527585 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 12220664 is about 3495.8066308078. The cubic root of 12220664 is about 230.3376515161.

Adding to 12220664 its reverse (46602221), we get a palindrome (58822885).

The spelling of 12220664 in words is "twelve million, two hundred twenty thousand, six hundred sixty-four".