643964150 has 24 divisors (see below), whose sum is σ = 1260815880. Its totient is φ = 244028160.

The previous prime is 643964117. The next prime is 643964159. The reversal of 643964150 is 51469346.

643964150 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643964159) 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, 337979 + ... + 339878.

It is an arithmetic number, because the mean of its divisors is an integer number (52533995).

Almost surely, 2^643964150 is an apocalyptic number.

643964150 is a deficient number, since it is larger than the sum of its proper divisors (616851730).

643964150 is a wasteful number, since it uses less digits than its factorization.

643964150 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 677888 (or 677883 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 38.

The square root of 643964150 is about 25376.4487271170. The cubic root of 643964150 is about 863.5494863167.

The spelling of 643964150 in words is "six hundred forty-three million, nine hundred sixty-four thousand, one hundred fifty".