643232019 has 8 divisors (see below), whose sum is σ = 859598080. Its totient is φ = 427843656.

The previous prime is 643231997. The next prime is 643232033. The reversal of 643232019 is 910232346.

643232019 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 643232019 - 2⁹ = 643231507 is a prime.

It is a super-2 number, since 2×643232019² = 827494860533632722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (643232059) 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, 242887 + ... + 245520.

It is an arithmetic number, because the mean of its divisors is an integer number (107449760).

Almost surely, 2^643232019 is an apocalyptic number.

643232019 is a deficient number, since it is larger than the sum of its proper divisors (216366061).

643232019 is a wasteful number, since it uses less digits than its factorization.

643232019 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 488849.

The product of its (nonzero) digits is 7776, while the sum is 30.

The square root of 643232019 is about 25362.0192216629. The cubic root of 643232019 is about 863.2221020994. Note that the first 3 decimals are identical.

The spelling of 643232019 in words is "six hundred forty-three million, two hundred thirty-two thousand, nineteen".