64740881760 has 48 divisors (see below), whose sum is σ = 203933779056. Its totient is φ = 17264235008.

The previous prime is 64740881717. The next prime is 64740881761. The reversal of 64740881760 is 6718804746.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (48).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64740881761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 67437939 + ... + 67438898.

It is an arithmetic number, because the mean of its divisors is an integer number (4248620397).

Almost surely, 2^64740881760 is an apocalyptic number.

64740881760 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

64740881760 is an abundant number, since it is smaller than the sum of its proper divisors (139192897296).

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

64740881760 is a wasteful number, since it uses less digits than its factorization.

64740881760 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134876855 (or 134876847 counting only the distinct ones).

The product of its (nonzero) digits is 1806336, while the sum is 51.

The spelling of 64740881760 in words is "sixty-four billion, seven hundred forty million, eight hundred eighty-one thousand, seven hundred sixty".