64536320 has 72 divisors (see below), whose sum is σ = 156194304. Its totient is φ = 25546752.

The previous prime is 64536319. The next prime is 64536323. The reversal of 64536320 is 2363546.

64536320 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64536323) 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 7 ways as a sum of consecutive naturals, for example, 162362 + ... + 162758.

Almost surely, 2^64536320 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 64536320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (78097152).

64536320 is an abundant number, since it is smaller than the sum of its proper divisors (91657984).

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

64536320 is a wasteful number, since it uses less digits than its factorization.

64536320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 545 (or 531 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 29.

The square root of 64536320 is about 8033.4500683081. The cubic root of 64536320 is about 401.1142266986.

Adding to 64536320 its reverse (2363546), we get a palindrome (66899866).

The spelling of 64536320 in words is "sixty-four million, five hundred thirty-six thousand, three hundred twenty".