643071042 has 16 divisors (see below), whose sum is σ = 1429046880. Its totient is φ = 214356996.

The previous prime is 643070999. The next prime is 643071059. The reversal of 643071042 is 240170346.

643071042 is a `hidden beast` number, since 643 + 0 + 7 + 10 + 4 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 643070997 and 643071015.

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 7 ways as a sum of consecutive naturals, for example, 5954308 + ... + 5954415.

It is an arithmetic number, because the mean of its divisors is an integer number (89315430).

Almost surely, 2^643071042 is an apocalyptic number.

643071042 is an abundant number, since it is smaller than the sum of its proper divisors (785975838).

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

643071042 is a wasteful number, since it uses less digits than its factorization.

643071042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11908734 (or 11908728 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 27.

The square root of 643071042 is about 25358.8454390179. The cubic root of 643071042 is about 863.1500853185.

The spelling of 643071042 in words is "six hundred forty-three million, seventy-one thousand, forty-two".