640830522080 has 192 divisors, whose sum is σ = 1813276886400. Its totient is φ = 213774446592.

The previous prime is 640830522077. The next prime is 640830522097. The reversal of 640830522080 is 80225038046.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1872764 + ... + 2188356.

It is an arithmetic number, because the mean of its divisors is an integer number (9444150450).

Almost surely, 2^640830522080 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 640830522080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (906638443200).

640830522080 is an abundant number, since it is smaller than the sum of its proper divisors (1172446364320).

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

640830522080 is a wasteful number, since it uses less digits than its factorization.

640830522080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 315666 (or 315644 counting only the distinct ones).

The product of its (nonzero) digits is 92160, while the sum is 38.

The spelling of 640830522080 in words is "six hundred forty billion, eight hundred thirty million, five hundred twenty-two thousand, eighty".