64643013 has 12 divisors (see below), whose sum is σ = 93632448. Its totient is φ = 42975720.

The previous prime is 64643011. The next prime is 64643021. The reversal of 64643013 is 31034646.

64643013 is a `hidden beast` number, since 6 + 4 + 643 + 0 + 13 = 666.

It is not a de Polignac number, because 64643013 - 2¹ = 64643011 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64643011) 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 11 ways as a sum of consecutive naturals, for example, 6483 + ... + 13088.

It is an arithmetic number, because the mean of its divisors is an integer number (7802704).

Almost surely, 2^64643013 is an apocalyptic number.

It is an amenable number.

64643013 is a deficient number, since it is larger than the sum of its proper divisors (28989435).

64643013 is a wasteful number, since it uses less digits than its factorization.

64643013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19944 (or 19941 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 27.

The square root of 64643013 is about 8040.0878726541. The cubic root of 64643013 is about 401.3351489017.

Adding to 64643013 its reverse (31034646), we get a palindrome (95677659).

The spelling of 64643013 in words is "sixty-four million, six hundred forty-three thousand, thirteen".