64043920 has 20 divisors (see below), whose sum is σ = 148902300. Its totient is φ = 25617536.

The previous prime is 64043897. The next prime is 64043921. The reversal of 64043920 is 2934046.

64043920 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 8928144 + 55115776 = 2988^2 + 7424^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is not an unprimeable number, because it can be changed into a prime (64043921) 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, 400195 + ... + 400354.

It is an arithmetic number, because the mean of its divisors is an integer number (7445115).

Almost surely, 2^64043920 is an apocalyptic number.

It is an amenable number.

64043920 is an abundant number, since it is smaller than the sum of its proper divisors (84858380).

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

64043920 is a wasteful number, since it uses less digits than its factorization.

64043920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 800562 (or 800556 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 28.

The square root of 64043920 is about 8002.7445292225. The cubic root of 64043920 is about 400.0914790774.

Adding to 64043920 its reverse (2934046), we get a palindrome (66977966).

The spelling of 64043920 in words is "sixty-four million, forty-three thousand, nine hundred twenty".