640242337280 has 960 divisors, whose sum is σ = 2086984424448. Its totient is φ = 183060725760.

The previous prime is 640242337271. The next prime is 640242337289. The reversal of 640242337280 is 82733242046.

It is an interprime number because it is at equal distance from previous prime (640242337271) and next prime (640242337289).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640242337289) 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, 1934266715 + ... + 1934267045.

Almost surely, 2^640242337280 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 640242337280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1043492212224).

640242337280 is an abundant number, since it is smaller than the sum of its proper divisors (1446742087168).

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

640242337280 is a wasteful number, since it uses less digits than its factorization.

640242337280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 435 (or 400 counting only the distinct ones).

The product of its (nonzero) digits is 387072, while the sum is 41.

The spelling of 640242337280 in words is "six hundred forty billion, two hundred forty-two million, three hundred thirty-seven thousand, two hundred eighty".