643227916 has 6 divisors (see below), whose sum is σ = 1125648860. Its totient is φ = 321613956.

The previous prime is 643227889. The next prime is 643227941. The reversal of 643227916 is 619722346.

It is a happy number.

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 as a sum of consecutive naturals, namely, 80403486 + ... + 80403493.

Almost surely, 2^643227916 is an apocalyptic number.

It is an amenable number.

643227916 is a deficient number, since it is larger than the sum of its proper divisors (482420944).

643227916 is a wasteful number, since it uses less digits than its factorization.

643227916 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160806983 (or 160806981 counting only the distinct ones).

The product of its digits is 108864, while the sum is 40.

The square root of 643227916 is about 25361.9383328641. The cubic root of 643227916 is about 863.2202666768.

The spelling of 643227916 in words is "six hundred forty-three million, two hundred twenty-seven thousand, nine hundred sixteen".