64365520 has 40 divisors (see below), whose sum is σ = 150231456. Its totient is φ = 25646208.

The previous prime is 64365503. The next prime is 64365527. The reversal of 64365520 is 2556346.

64365520 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64365527) 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, 21219 + ... + 24061.

Almost surely, 2^64365520 is an apocalyptic number.

It is an amenable number.

64365520 is an abundant number, since it is smaller than the sum of its proper divisors (85865936).

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

64365520 is a wasteful number, since it uses less digits than its factorization.

64365520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3139 (or 3133 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 31.

The square root of 64365520 is about 8022.8124744381. The cubic root of 64365520 is about 400.7600548767.

The spelling of 64365520 in words is "sixty-four million, three hundred sixty-five thousand, five hundred twenty".