64780515072 has 432 divisors, whose sum is σ = 240001819680. Its totient is φ = 17083809792.

The previous prime is 64780515011. The next prime is 64780515103. The reversal of 64780515072 is 27051508746.

64780515072 is a `hidden beast` number, since 64 + 7 + 8 + 0 + 515 + 0 + 72 = 666.

It is a tau number, because it is divible by the number of its divisors (432).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4395588 + ... + 4410300.

Almost surely, 2^64780515072 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 64780515072, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (120000909840).

64780515072 is an abundant number, since it is smaller than the sum of its proper divisors (175221304608).

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

64780515072 is a wasteful number, since it uses less digits than its factorization.

64780515072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14765 (or 14738 counting only the distinct ones).

The product of its (nonzero) digits is 470400, while the sum is 45.

The spelling of 64780515072 in words is "sixty-four billion, seven hundred eighty million, five hundred fifteen thousand, seventy-two".