64523613 has 48 divisors (see below), whose sum is σ = 109975040. Its totient is φ = 32931360.

The previous prime is 64523611. The next prime is 64523633. The reversal of 64523613 is 31632546.

It is not a de Polignac number, because 64523613 - 2¹ = 64523611 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64523611) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 170058 + ... + 170436.

Almost surely, 2^64523613 is an apocalyptic number.

It is an amenable number.

64523613 is a deficient number, since it is larger than the sum of its proper divisors (45451427).

64523613 is a wasteful number, since it uses less digits than its factorization.

64523613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 478 (or 467 counting only the distinct ones).

The product of its digits is 12960, while the sum is 30.

The square root of 64523613 is about 8032.6591487502. The cubic root of 64523613 is about 401.0878989241.

The spelling of 64523613 in words is "sixty-four million, five hundred twenty-three thousand, six hundred thirteen".