64731287352528 has 120 divisors (see below), whose sum is σ = 189121617971520. Its totient is φ = 20629408250880.

The previous prime is 64731287352481. The next prime is 64731287352553. The reversal of 64731287352528 is 82525378213746.

64731287352528 is a `hidden beast` number, since 6 + 4 + 7 + 3 + 1 + 2 + 87 + 3 + 525 + 28 = 666.

It is a super-2 number, since 2×64731287352528² (a number of 28 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (63) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2635143 + ... + 11679321.

It is an arithmetic number, because the mean of its divisors is an integer number (1576013483096).

Almost surely, 2^{64731287352528} 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 64731287352528, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (94560808985760).

64731287352528 is an abundant number, since it is smaller than the sum of its proper divisors (124390330618992).

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

64731287352528 is a wasteful number, since it uses less digits than its factorization.

64731287352528 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9046377 (or 9046368 counting only the distinct ones).

The product of its digits is 135475200, while the sum is 63.

The spelling of 64731287352528 in words is "sixty-four trillion, seven hundred thirty-one billion, two hundred eighty-seven million, three hundred fifty-two thousand, five hundred twenty-eight".