640350032 has 60 divisors (see below), whose sum is σ = 1447491060. Its totient is φ = 273627648.

The previous prime is 640350031. The next prime is 640350089. The reversal of 640350032 is 230053046.

640350032 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 275692816 + 364657216 = 16604^2 + 19096^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640350031) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 319658 + ... + 321654.

It is an arithmetic number, because the mean of its divisors is an integer number (24124851).

Almost surely, 2^640350032 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 640350032, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (723745530).

640350032 is an abundant number, since it is smaller than the sum of its proper divisors (807141028).

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

640350032 is a wasteful number, since it uses less digits than its factorization.

640350032 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2428 (or 2415 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 23.

The square root of 640350032 is about 25305.1384505203. The cubic root of 640350032 is about 861.9309559383.

The spelling of 640350032 in words is "six hundred forty million, three hundred fifty thousand, thirty-two".