643469875 has 16 divisors (see below), whose sum is σ = 806289120. Its totient is φ = 512700000.

The previous prime is 643469833. The next prime is 643469887. The reversal of 643469875 is 578964346.

It is not a de Polignac number, because 643469875 - 2⁷ = 643469747 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21121 + ... + 41629.

It is an arithmetic number, because the mean of its divisors is an integer number (50393070).

Almost surely, 2^643469875 is an apocalyptic number.

643469875 is a deficient number, since it is larger than the sum of its proper divisors (162819245).

643469875 is a wasteful number, since it uses less digits than its factorization.

643469875 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20775 (or 20765 counting only the distinct ones).

The product of its digits is 4354560, while the sum is 52.

The square root of 643469875 is about 25366.7080047845. The cubic root of 643469875 is about 863.3284904876.

The spelling of 643469875 in words is "six hundred forty-three million, four hundred sixty-nine thousand, eight hundred seventy-five".