643475715 has 16 divisors (see below), whose sum is σ = 1074325248. Its totient is φ = 328265696.

The previous prime is 643475699. The next prime is 643475797. The reversal of 643475715 is 517574346.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 643475715 - 2⁴ = 643475699 is a prime.

It is a super-2 number, since 2×643475715² = 828121991589522450, which contains 22 as substring.

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 15 ways as a sum of consecutive naturals, for example, 932229 + ... + 932918.

It is an arithmetic number, because the mean of its divisors is an integer number (67145328).

Almost surely, 2^643475715 is an apocalyptic number.

643475715 is a deficient number, since it is larger than the sum of its proper divisors (430849533).

643475715 is a wasteful number, since it uses less digits than its factorization.

643475715 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1865178.

The product of its digits is 352800, while the sum is 42.

The square root of 643475715 is about 25366.8231160309. The cubic root of 643475715 is about 863.3311022769.

The spelling of 643475715 in words is "six hundred forty-three million, four hundred seventy-five thousand, seven hundred fifteen".