643274671 has 12 divisors (see below), whose sum is σ = 697708728. Its totient is φ = 592816224.

The previous prime is 643274669. The next prime is 643274677. The reversal of 643274671 is 176472346.

It is not a de Polignac number, because 643274671 - 2¹ = 643274669 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643274677) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 112641 + ... + 118213.

It is an arithmetic number, because the mean of its divisors is an integer number (58142394).

Almost surely, 2^643274671 is an apocalyptic number.

643274671 is a deficient number, since it is larger than the sum of its proper divisors (54434057).

643274671 is a wasteful number, since it uses less digits than its factorization.

643274671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6282 (or 6269 counting only the distinct ones).

The product of its digits is 169344, while the sum is 40.

The square root of 643274671 is about 25362.8600713721. The cubic root of 643274671 is about 863.2411814436.

The spelling of 643274671 in words is "six hundred forty-three million, two hundred seventy-four thousand, six hundred seventy-one".