640308480 has 432 divisors, whose sum is σ = 2466241344. Its totient is φ = 141066240.

The previous prime is 640308467. The next prime is 640308497. The reversal of 640308480 is 84803046.

It is a hoax number, since the sum of its digits (33) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 7714519 + ... + 7714601.

It is an arithmetic number, because the mean of its divisors is an integer number (5708892).

Almost surely, 2^640308480 is an apocalyptic number.

640308480 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 640308480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1233120672).

640308480 is an abundant number, since it is smaller than the sum of its proper divisors (1825932864).

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

640308480 is a wasteful number, since it uses less digits than its factorization.

640308480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162 (or 141 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 33.

The square root of 640308480 is about 25304.3174181798. The cubic root of 640308480 is about 861.9123121091.

The spelling of 640308480 in words is "six hundred forty million, three hundred eight thousand, four hundred eighty".