64539613 has 4 divisors (see below), whose sum is σ = 66621568. Its totient is φ = 62457660.

The previous prime is 64539589. The next prime is 64539641. The reversal of 64539613 is 31693546.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 64539613 - 2¹⁷ = 64408541 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64539313) 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 3 ways as a sum of consecutive naturals, for example, 1040931 + ... + 1040992.

It is an arithmetic number, because the mean of its divisors is an integer number (16655392).

Almost surely, 2^64539613 is an apocalyptic number.

It is an amenable number.

64539613 is a deficient number, since it is larger than the sum of its proper divisors (2081955).

64539613 is a wasteful number, since it uses less digits than its factorization.

64539613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2081954.

The product of its digits is 58320, while the sum is 37.

The square root of 64539613 is about 8033.6550212217. The cubic root of 64539613 is about 401.1210489380.

The spelling of 64539613 in words is "sixty-four million, five hundred thirty-nine thousand, six hundred thirteen".