640306080 has 384 divisors, whose sum is σ = 2449440000. Its totient is φ = 155602944.

The previous prime is 640306067. The next prime is 640306097. The reversal of 640306080 is 80603046.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2380186 + ... + 2380454.

It is an arithmetic number, because the mean of its divisors is an integer number (6378750).

Almost surely, 2^640306080 is an apocalyptic number.

640306080 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 640306080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1224720000).

640306080 is an abundant number, since it is smaller than the sum of its proper divisors (1809133920).

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

640306080 is a wasteful number, since it uses less digits than its factorization.

640306080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 341 (or 327 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 640306080 is about 25304.2699953980. The cubic root of 640306080 is about 861.9112352365.

The spelling of 640306080 in words is "six hundred forty million, three hundred six thousand, eighty".