64744319 has 4 divisors (see below), whose sum is σ = 64803096. Its totient is φ = 64685544.

The previous prime is 64744307. The next prime is 64744349. The reversal of 64744319 is 91344746.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 64744319 - 2²⁰ = 63695743 is a prime.

It is a super-2 number, since 2×64744319² = 8383653685547522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64744349) 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, 27704 + ... + 29949.

It is an arithmetic number, because the mean of its divisors is an integer number (16200774).

Almost surely, 2^64744319 is an apocalyptic number.

64744319 is a deficient number, since it is larger than the sum of its proper divisors (58777).

64744319 is a wasteful number, since it uses less digits than its factorization.

64744319 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58776.

The product of its digits is 72576, while the sum is 38.

The square root of 64744319 is about 8046.3854618083. The cubic root of 64744319 is about 401.5446917234.

The spelling of 64744319 in words is "sixty-four million, seven hundred forty-four thousand, three hundred nineteen".