641235668 has 24 divisors (see below), whose sum is σ = 1135088640. Its totient is φ = 316935200.

The previous prime is 641235649. The next prime is 641235671. The reversal of 641235668 is 866532146.

641235668 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×641235668² = 822366363830812448, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 444893 + ... + 446331.

It is an arithmetic number, because the mean of its divisors is an integer number (47295360).

Almost surely, 2^641235668 is an apocalyptic number.

It is an amenable number.

641235668 is a deficient number, since it is larger than the sum of its proper divisors (493852972).

641235668 is a wasteful number, since it uses less digits than its factorization.

641235668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2647 (or 2645 counting only the distinct ones).

The product of its digits is 207360, while the sum is 41.

The square root of 641235668 is about 25322.6315378161. The cubic root of 641235668 is about 862.3281373734.

The spelling of 641235668 in words is "six hundred forty-one million, two hundred thirty-five thousand, six hundred sixty-eight".