643232623 has 4 divisors (see below), whose sum is σ = 701708328. Its totient is φ = 584756920.

The previous prime is 643232599. The next prime is 643232633. The reversal of 643232623 is 326232346.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 643232623 - 2⁵ = 643232591 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643232633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29237836 + ... + 29237857.

It is an arithmetic number, because the mean of its divisors is an integer number (175427082).

Almost surely, 2^643232623 is an apocalyptic number.

643232623 is a deficient number, since it is larger than the sum of its proper divisors (58475705).

643232623 is a wasteful number, since it uses less digits than its factorization.

643232623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58475704.

The product of its digits is 31104, while the sum is 31.

The square root of 643232623 is about 25362.0311292294. The cubic root of 643232623 is about 863.2223722901. Note that the first 3 decimals are identical.

Adding to 643232623 its reverse (326232346), we get a palindrome (969464969).

The spelling of 643232623 in words is "six hundred forty-three million, two hundred thirty-two thousand, six hundred twenty-three".