64438974344 has 8 divisors (see below), whose sum is σ = 120823076910. Its totient is φ = 32219487168.

The previous prime is 64438974343. The next prime is 64438974367. The reversal of 64438974344 is 44347983446.

It can be written as a sum of positive squares in only one way, i.e., 64433730244 + 5244100 = 253838^2 + 2290^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 64438974344.

It is not an unprimeable number, because it can be changed into a prime (64438974343) 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 as a sum of consecutive naturals, namely, 4027435889 + ... + 4027435904.

Almost surely, 2^64438974344 is an apocalyptic number.

It is an amenable number.

64438974344 is a deficient number, since it is larger than the sum of its proper divisors (56384102566).

64438974344 is a wasteful number, since it uses less digits than its factorization.

64438974344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8054871799 (or 8054871795 counting only the distinct ones).

The product of its digits is 27869184, while the sum is 56.

The spelling of 64438974344 in words is "sixty-four billion, four hundred thirty-eight million, nine hundred seventy-four thousand, three hundred forty-four".