643214433 has 8 divisors (see below), whose sum is σ = 857812896. Its totient is φ = 428712800.

The previous prime is 643214417. The next prime is 643214449. The reversal of 643214433 is 334412346.

It is an interprime number because it is at equal distance from previous prime (643214417) and next prime (643214449).

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

It is a cyclic number.

It is not a de Polignac number, because 643214433 - 2⁴ = 643214417 is a prime.

It is a super-2 number, since 2×643214433² = 827449613639022978, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 643214433.

It is not an unprimeable number, because it can be changed into a prime (643214333) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6948 + ... + 36533.

It is an arithmetic number, because the mean of its divisors is an integer number (107226612).

Almost surely, 2^643214433 is an apocalyptic number.

It is an amenable number.

643214433 is a deficient number, since it is larger than the sum of its proper divisors (214598463).

643214433 is a wasteful number, since it uses less digits than its factorization.

643214433 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48415.

The product of its digits is 20736, while the sum is 30.

The square root of 643214433 is about 25361.6725197689. The cubic root of 643214433 is about 863.2142351806.

Adding to 643214433 its reverse (334412346), we get a palindrome (977626779).

The spelling of 643214433 in words is "six hundred forty-three million, two hundred fourteen thousand, four hundred thirty-three".