643474473 has 32 divisors (see below), whose sum is σ = 915425280. Its totient is φ = 401174400.

The previous prime is 643474453. The next prime is 643474493. The reversal of 643474473 is 374474346.

It is an interprime number because it is at equal distance from previous prime (643474453) and next prime (643474493).

It is not a de Polignac number, because 643474473 - 2⁵ = 643474441 is a prime.

It is not an unprimeable number, because it can be changed into a prime (643474423) by changing a digit.

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 in 31 ways as a sum of consecutive naturals, for example, 1070373 + ... + 1070973.

It is an arithmetic number, because the mean of its divisors is an integer number (28607040).

Almost surely, 2^643474473 is an apocalyptic number.

It is an amenable number.

643474473 is a deficient number, since it is larger than the sum of its proper divisors (271950807).

643474473 is a wasteful number, since it uses less digits than its factorization.

643474473 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 949.

The product of its digits is 677376, while the sum is 42.

The square root of 643474473 is about 25366.7986352240. The cubic root of 643474473 is about 863.3305468258.

The spelling of 643474473 in words is "six hundred forty-three million, four hundred seventy-four thousand, four hundred seventy-three".