64516520 has 16 divisors (see below), whose sum is σ = 145162260. Its totient is φ = 25806592.

The previous prime is 64516483. The next prime is 64516523. The reversal of 64516520 is 2561546.

64516520 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 56821444 + 7695076 = 7538^2 + 2774^2 .

It is not an unprimeable number, because it can be changed into a prime (64516523) 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, 806417 + ... + 806496.

Almost surely, 2^64516520 is an apocalyptic number.

It is an amenable number.

64516520 is an abundant number, since it is smaller than the sum of its proper divisors (80645740).

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

64516520 is a wasteful number, since it uses less digits than its factorization.

64516520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1612924 (or 1612920 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 29.

The square root of 64516520 is about 8032.2176265338. The cubic root of 64516520 is about 401.0732013553.

The spelling of 64516520 in words is "sixty-four million, five hundred sixteen thousand, five hundred twenty".