64040320 has 64 divisors (see below), whose sum is σ = 156427200. Its totient is φ = 25059328.

The previous prime is 64040299. The next prime is 64040329. The reversal of 64040320 is 2304046.

It is a tau number, because it is divible by the number of its divisors (64).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64040329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29016 + ... + 31144.

It is an arithmetic number, because the mean of its divisors is an integer number (2444175).

Almost surely, 2^64040320 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64040320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (78213600).

64040320 is an abundant number, since it is smaller than the sum of its proper divisors (92386880).

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

64040320 is a wasteful number, since it uses less digits than its factorization.

64040320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2195 (or 2183 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 19.

The square root of 64040320 is about 8002.5196032250. The cubic root of 64040320 is about 400.0839823662.

Adding to 64040320 its reverse (2304046), we get a palindrome (66344366).

The spelling of 64040320 in words is "sixty-four million, forty thousand, three hundred twenty".