64520013 has 16 divisors (see below), whose sum is σ = 87238080. Its totient is φ = 42412416.

The previous prime is 64520009. The next prime is 64520017. The reversal of 64520013 is 31002546.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (64520009) and next prime (64520017).

It is not a de Polignac number, because 64520013 - 2² = 64520009 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64520017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 73131 + ... + 74007.

It is an arithmetic number, because the mean of its divisors is an integer number (5452380).

Almost surely, 2^64520013 is an apocalyptic number.

It is an amenable number.

64520013 is a deficient number, since it is larger than the sum of its proper divisors (22718067).

64520013 is a wasteful number, since it uses less digits than its factorization.

64520013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1196.

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 64520013 is about 8032.4350604284. The cubic root of 64520013 is about 401.0804394157.

Adding to 64520013 its reverse (31002546), we get a palindrome (95522559).

The spelling of 64520013 in words is "sixty-four million, five hundred twenty thousand, thirteen".