643364722 has 64 divisors (see below), whose sum is σ = 1309480704. Its totient is φ = 228925440.

The previous prime is 643364707. The next prime is 643364773. The reversal of 643364722 is 227463346.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 192538 + ... + 195850.

It is an arithmetic number, because the mean of its divisors is an integer number (20460636).

Almost surely, 2^643364722 is an apocalyptic number.

643364722 is an abundant number, since it is smaller than the sum of its proper divisors (666115982).

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

643364722 is a wasteful number, since it uses less digits than its factorization.

643364722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3443.

The product of its digits is 145152, while the sum is 37.

The square root of 643364722 is about 25364.6352625067. The cubic root of 643364722 is about 863.2814608183.

The spelling of 643364722 in words is "six hundred forty-three million, three hundred sixty-four thousand, seven hundred twenty-two".