643474474 has 8 divisors (see below), whose sum is σ = 991298628. Its totient is φ = 313041600.

The previous prime is 643474453. The next prime is 643474493. The reversal of 643474474 is 474474346.

It can be written as a sum of positive squares in 2 ways, for example, as 642977449 + 497025 = 25357^2 + 705^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 643474474.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 4347727 + ... + 4347874.

Almost surely, 2^643474474 is an apocalyptic number.

643474474 is a deficient number, since it is larger than the sum of its proper divisors (347824154).

643474474 is a wasteful number, since it uses less digits than its factorization.

643474474 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8695640.

The product of its digits is 903168, while the sum is 43.

The square root of 643474474 is about 25366.7986549348. The cubic root of 643474474 is about 863.3305472730.

It can be divided in two parts, 6434 and 74474, that added together give a palindrome (80908).

The spelling of 643474474 in words is "six hundred forty-three million, four hundred seventy-four thousand, four hundred seventy-four".