64738787328 has 160 divisors (see below), whose sum is σ = 193422096120. Its totient is φ = 21578711040.

The previous prime is 64738787297. The next prime is 64738787369. The reversal of 64738787328 is 82378783746.

64738787328 is a `hidden beast` number, since 6 + 473 + 8 + 78 + 73 + 28 = 666.

It is a super-2 number, since 2×64738787328² (a number of 22 digits) contains 22 as substring.

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 9 ways as a sum of consecutive naturals, for example, 2642013 + ... + 2666403.

Almost surely, 2^64738787328 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64738787328, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (96711048060).

64738787328 is an abundant number, since it is smaller than the sum of its proper divisors (128683308792).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

64738787328 is an frugal number, since it uses more digits than its factorization.

64738787328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24433 (or 24396 counting only the distinct ones).

The product of its digits is 75866112, while the sum is 63.

The spelling of 64738787328 in words is "sixty-four billion, seven hundred thirty-eight million, seven hundred eighty-seven thousand, three hundred twenty-eight".