640001140 has 12 divisors (see below), whose sum is σ = 1344002436. Its totient is φ = 256000448.

The previous prime is 640001137. The next prime is 640001177. The reversal of 640001140 is 41100046.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 78216336 + 561784804 = 8844^2 + 23702^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16000009 + ... + 16000048.

It is an arithmetic number, because the mean of its divisors is an integer number (112000203).

Almost surely, 2^640001140 is an apocalyptic number.

It is an amenable number.

640001140 is an abundant number, since it is smaller than the sum of its proper divisors (704001296).

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

640001140 is a wasteful number, since it uses less digits than its factorization.

640001140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32000066 (or 32000064 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 640001140 is about 25298.2438125653. The cubic root of 640001140 is about 861.7743876907.

Adding to 640001140 its reverse (41100046), we get a palindrome (681101186).

The spelling of 640001140 in words is "six hundred forty million, one thousand, one hundred forty".