64438321264 has 20 divisors (see below), whose sum is σ = 127505615904. Its totient is φ = 31533646208.

The previous prime is 64438321249. The next prime is 64438321307. The reversal of 64438321264 is 46212383446.

It is a self number, because there is not a number n which added to its sum of digits gives 64438321264.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42843877 + ... + 42845380.

Almost surely, 2^64438321264 is an apocalyptic number.

It is an amenable number.

64438321264 is a deficient number, since it is larger than the sum of its proper divisors (63067294640).

64438321264 is a wasteful number, since it uses less digits than its factorization.

64438321264 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85689312 (or 85689306 counting only the distinct ones).

The product of its digits is 663552, while the sum is 43.

The spelling of 64438321264 in words is "sixty-four billion, four hundred thirty-eight million, three hundred twenty-one thousand, two hundred sixty-four".