664036220 has 24 divisors (see below), whose sum is σ = 1455106464. Its totient is φ = 254065856.

The previous prime is 664036211. The next prime is 664036223. The reversal of 664036220 is 22630466.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664036223) 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, 721319 + ... + 722238.

It is an arithmetic number, because the mean of its divisors is an integer number (60629436).

Almost surely, 2^664036220 is an apocalyptic number.

It is an amenable number.

664036220 is an abundant number, since it is smaller than the sum of its proper divisors (791070244).

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

664036220 is a wasteful number, since it uses less digits than its factorization.

664036220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1443589 (or 1443587 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 29.

The square root of 664036220 is about 25768.9002481674. The cubic root of 664036220 is about 872.4299968740.

Adding to 664036220 its reverse (22630466), we get a palindrome (686666686).

The spelling of 664036220 in words is "six hundred sixty-four million, thirty-six thousand, two hundred twenty".