640145612 has 6 divisors (see below), whose sum is σ = 1120254828. Its totient is φ = 320072804.

The previous prime is 640145603. The next prime is 640145617. The reversal of 640145612 is 216541046.

640145612 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (640145617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80018198 + ... + 80018205.

It is an arithmetic number, because the mean of its divisors is an integer number (186709138).

Almost surely, 2^640145612 is an apocalyptic number.

It is an amenable number.

640145612 is a deficient number, since it is larger than the sum of its proper divisors (480109216).

640145612 is a wasteful number, since it uses less digits than its factorization.

640145612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160036407 (or 160036405 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 640145612 is about 25301.0990275126. The cubic root of 640145612 is about 861.8392276284.

Adding to 640145612 its reverse (216541046), we get a palindrome (856686658).

The spelling of 640145612 in words is "six hundred forty million, one hundred forty-five thousand, six hundred twelve".