640160500 has 288 divisors, whose sum is σ = 1815035040. Its totient is φ = 195686400.

The previous prime is 640160497. The next prime is 640160501. The reversal of 640160500 is 5061046.

It can be written as a sum of positive squares in 16 ways, for example, as 280830564 + 359329936 = 16758^2 + 18956^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640160501) 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, 12078474 + ... + 12078526.

It is an arithmetic number, because the mean of its divisors is an integer number (6302205).

Almost surely, 2^640160500 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 640160500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (907517520).

640160500 is an abundant number, since it is smaller than the sum of its proper divisors (1174874540).

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

640160500 is a wasteful number, since it uses less digits than its factorization.

640160500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132 (or 113 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 640160500 is about 25301.3932422703. The cubic root of 640160500 is about 861.8459089015.

The spelling of 640160500 in words is "six hundred forty million, one hundred sixty thousand, five hundred".