643274416 has 20 divisors (see below), whose sum is σ = 1251841752. Its totient is φ = 320218496.

The previous prime is 643274399. The next prime is 643274417. The reversal of 643274416 is 614472346.

643274416 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (643274417) 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, 84925 + ... + 92188.

Almost surely, 2^643274416 is an apocalyptic number.

It is an amenable number.

643274416 is a deficient number, since it is larger than the sum of its proper divisors (608567336).

643274416 is a wasteful number, since it uses less digits than its factorization.

643274416 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 177348 (or 177342 counting only the distinct ones).

The product of its digits is 96768, while the sum is 37.

The square root of 643274416 is about 25362.8550443360. The cubic root of 643274416 is about 863.2410673780.

The spelling of 643274416 in words is "six hundred forty-three million, two hundred seventy-four thousand, four hundred sixteen".