64644313 has 4 divisors (see below), whose sum is σ = 65109520. Its totient is φ = 64179108.

The previous prime is 64644311. The next prime is 64644373. The reversal of 64644313 is 31344646.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 31344646 = 2 ⋅15672323.

It is a cyclic number.

It is not a de Polignac number, because 64644313 - 2¹ = 64644311 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64644311) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 232395 + ... + 232672.

It is an arithmetic number, because the mean of its divisors is an integer number (16277380).

Almost surely, 2^64644313 is an apocalyptic number.

It is an amenable number.

64644313 is a deficient number, since it is larger than the sum of its proper divisors (465207).

64644313 is a wasteful number, since it uses less digits than its factorization.

64644313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 465206.

The product of its digits is 20736, while the sum is 31.

The square root of 64644313 is about 8040.1687171352. The cubic root of 64644313 is about 401.3378392270.

Adding to 64644313 its reverse (31344646), we get a palindrome (95988959).

The spelling of 64644313 in words is "sixty-four million, six hundred forty-four thousand, three hundred thirteen".