64133220 has 24 divisors (see below), whose sum is σ = 179573184. Its totient is φ = 17102176.

The previous prime is 64133219. The next prime is 64133257. The reversal of 64133220 is 2233146.

It is a happy number.

It is a super-2 number, since 2×64133220² = 8226139815136800, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 534384 + ... + 534503.

It is an arithmetic number, because the mean of its divisors is an integer number (7482216).

Almost surely, 2^64133220 is an apocalyptic number.

64133220 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

64133220 is an abundant number, since it is smaller than the sum of its proper divisors (115439964).

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

64133220 is a wasteful number, since it uses less digits than its factorization.

64133220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1068899 (or 1068897 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 21.

The square root of 64133220 is about 8008.3219216013. The cubic root of 64133220 is about 400.2773493156.

Adding to 64133220 its reverse (2233146), we get a palindrome (66366366).

The spelling of 64133220 in words is "sixty-four million, one hundred thirty-three thousand, two hundred twenty".