643254423 has 16 divisors (see below), whose sum is σ = 1013998080. Its totient is φ = 354898656.

The previous prime is 643254401. The next prime is 643254439. The reversal of 643254423 is 324452346.

643254423 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 643254423 - 2¹³ = 643246231 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643254023) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 527515 + ... + 528732.

It is an arithmetic number, because the mean of its divisors is an integer number (63374880).

Almost surely, 2^643254423 is an apocalyptic number.

643254423 is a deficient number, since it is larger than the sum of its proper divisors (370743657).

643254423 is a wasteful number, since it uses less digits than its factorization.

643254423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1056286.

The product of its digits is 69120, while the sum is 33.

The square root of 643254423 is about 25362.4609018920. The cubic root of 643254423 is about 863.2321240940.

The spelling of 643254423 in words is "six hundred forty-three million, two hundred fifty-four thousand, four hundred twenty-three".