643283434 has 8 divisors (see below), whose sum is σ = 1021685508. Its totient is φ = 302721600.

The previous prime is 643283429. The next prime is 643283441. The reversal of 643283434 is 434382346.

It can be written as a sum of positive squares in 2 ways, for example, as 622352809 + 20930625 = 24947^2 + 4575^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 643283393 and 643283402.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9460017 + ... + 9460084.

Almost surely, 2^643283434 is an apocalyptic number.

643283434 is a deficient number, since it is larger than the sum of its proper divisors (378402074).

643283434 is a wasteful number, since it uses less digits than its factorization.

643283434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18920120.

The product of its digits is 165888, while the sum is 37.

The square root of 643283434 is about 25363.0328233829. The cubic root of 643283434 is about 863.2451012560.

The spelling of 643283434 in words is "six hundred forty-three million, two hundred eighty-three thousand, four hundred thirty-four".