640441468980 has 288 divisors, whose sum is σ = 2063219558400. Its totient is φ = 160468197120.

The previous prime is 640441468949. The next prime is 640441468981. The reversal of 640441468980 is 89864144046.

640441468980 is a `hidden beast` number, since 6 + 4 + 0 + 441 + 46 + 89 + 80 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640441468981) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 83181171 + ... + 83188869.

It is an arithmetic number, because the mean of its divisors is an integer number (7163956800).

Almost surely, 2^640441468980 is an apocalyptic number.

640441468980 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 640441468980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1031609779200).

640441468980 is an abundant number, since it is smaller than the sum of its proper divisors (1422778089420).

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

640441468980 is a wasteful number, since it uses less digits than its factorization.

640441468980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8091 (or 8086 counting only the distinct ones).

The product of its (nonzero) digits is 5308416, while the sum is 54.

The spelling of 640441468980 in words is "six hundred forty billion, four hundred forty-one million, four hundred sixty-eight thousand, nine hundred eighty".