643068772 has 12 divisors (see below), whose sum is σ = 1125609856. Its totient is φ = 321465960.

The previous prime is 643068763. The next prime is 643068773. The reversal of 643068772 is 277860346.

It is a happy number.

It is a hoax number, since the sum of its digits (43) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (643068773) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8197 + ... + 36787.

Almost surely, 2^643068772 is an apocalyptic number.

It is an amenable number.

643068772 is a deficient number, since it is larger than the sum of its proper divisors (482541084).

643068772 is a wasteful number, since it uses less digits than its factorization.

643068772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34218 (or 34216 counting only the distinct ones).

The product of its (nonzero) digits is 338688, while the sum is 43.

The square root of 643068772 is about 25358.8006814202. The cubic root of 643068772 is about 863.1490696957.

The spelling of 643068772 in words is "six hundred forty-three million, sixty-eight thousand, seven hundred seventy-two".