640750360 has 64 divisors (see below), whose sum is σ = 1498694400. Its totient is φ = 246253056.

The previous prime is 640750351. The next prime is 640750361. The reversal of 640750360 is 63057046.

It is a super-2 number, since 2×640750360² = 821122047680259200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640750361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 257442 + ... + 259918.

It is an arithmetic number, because the mean of its divisors is an integer number (23417100).

Almost surely, 2^640750360 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 640750360, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (749347200).

640750360 is an abundant number, since it is smaller than the sum of its proper divisors (857944040).

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

640750360 is a wasteful number, since it uses less digits than its factorization.

640750360 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2740 (or 2736 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 31.

The square root of 640750360 is about 25313.0472286527. The cubic root of 640750360 is about 862.1105364788.

The spelling of 640750360 in words is "six hundred forty million, seven hundred fifty thousand, three hundred sixty".