664134220 has 24 divisors (see below), whose sum is σ = 1442775600. Its totient is φ = 256492992.

The previous prime is 664134199. The next prime is 664134221. The reversal of 664134220 is 22431466.

664134220 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (664134221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 571950 + ... + 573109.

It is an arithmetic number, because the mean of its divisors is an integer number (60115650).

Almost surely, 2^664134220 is an apocalyptic number.

It is an amenable number.

664134220 is an abundant number, since it is smaller than the sum of its proper divisors (778641380).

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

664134220 is a wasteful number, since it uses less digits than its factorization.

664134220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1145097 (or 1145095 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 28.

The square root of 664134220 is about 25770.8016949415. The cubic root of 664134220 is about 872.4729131746.

Adding to 664134220 its reverse (22431466), we get a palindrome (686565686).

The spelling of 664134220 in words is "six hundred sixty-four million, one hundred thirty-four thousand, two hundred twenty".