64545220 has 12 divisors (see below), whose sum is σ = 135545004. Its totient is φ = 25818080.

The previous prime is 64545211. The next prime is 64545227. The reversal of 64545220 is 2254546.

64545220 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 23174596 + 41370624 = 4814^2 + 6432^2 .

It is a super-3 number, since 3×64545220³ (a number of 24 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (64545227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1613611 + ... + 1613650.

It is an arithmetic number, because the mean of its divisors is an integer number (11295417).

Almost surely, 2^64545220 is an apocalyptic number.

It is an amenable number.

64545220 is an abundant number, since it is smaller than the sum of its proper divisors (70999784).

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

64545220 is a wasteful number, since it uses less digits than its factorization.

64545220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3227270 (or 3227268 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 28.

The square root of 64545220 is about 8034.0039830710. The cubic root of 64545220 is about 401.1326646496.

Adding to 64545220 its reverse (2254546), we get a palindrome (66799766).

The spelling of 64545220 in words is "sixty-four million, five hundred forty-five thousand, two hundred twenty".