64944739 has 4 divisors (see below), whose sum is σ = 64967656. Its totient is φ = 64921824.

The previous prime is 64944703. The next prime is 64944787. The reversal of 64944739 is 93744946.

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 64944739 - 2⁷ = 64944611 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64944799) 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, 6489 + ... + 13114.

It is an arithmetic number, because the mean of its divisors is an integer number (16241914).

Almost surely, 2^64944739 is an apocalyptic number.

64944739 is a deficient number, since it is larger than the sum of its proper divisors (22917).

64944739 is a wasteful number, since it uses less digits than its factorization.

64944739 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22916.

The product of its digits is 653184, while the sum is 46.

The square root of 64944739 is about 8058.8298778421. The cubic root of 64944739 is about 401.9586003091.

The spelling of 64944739 in words is "sixty-four million, nine hundred forty-four thousand, seven hundred thirty-nine".