64519867980 has 192 divisors, whose sum is σ = 203620300800. Its totient is φ = 17170294464.

The previous prime is 64519867949. The next prime is 64519867987. The reversal of 64519867980 is 8976891546.

64519867980 is a `hidden beast` number, since 6 + 451 + 98 + 6 + 7 + 98 + 0 = 666.

64519867980 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (64519867987) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 27073869 + ... + 27076251.

It is an arithmetic number, because the mean of its divisors is an integer number (1060522400).

Almost surely, 2^64519867980 is an apocalyptic number.

64519867980 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64519867980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (101810150400).

64519867980 is an abundant number, since it is smaller than the sum of its proper divisors (139100432820).

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

64519867980 is a wasteful number, since it uses less digits than its factorization.

64519867980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3032 (or 3012 counting only the distinct ones).

The product of its (nonzero) digits is 26127360, while the sum is 63.

The spelling of 64519867980 in words is "sixty-four billion, five hundred nineteen million, eight hundred sixty-seven thousand, nine hundred eighty".