643254042 has 16 divisors (see below), whose sum is σ = 1293697440. Its totient is φ = 213219792.

The previous prime is 643254037. The next prime is 643254047. The reversal of 643254042 is 240452346.

643254042 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (643254037) and next prime (643254047).

It is not an unprimeable number, because it can be changed into a prime (643254047) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 298393 + ... + 300540.

It is an arithmetic number, because the mean of its divisors is an integer number (80856090).

Almost surely, 2^643254042 is an apocalyptic number.

643254042 is an abundant number, since it is smaller than the sum of its proper divisors (650443398).

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

643254042 is a wasteful number, since it uses less digits than its factorization.

643254042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 599117.

The product of its (nonzero) digits is 23040, while the sum is 30.

The square root of 643254042 is about 25362.4533907901. The cubic root of 643254042 is about 863.2319536630.

The spelling of 643254042 in words is "six hundred forty-three million, two hundred fifty-four thousand, forty-two".