643674523 has 8 divisors (see below), whose sum is σ = 647880480. Its totient is φ = 639482880.

The previous prime is 643674511. The next prime is 643674547. The reversal of 643674523 is 325476346.

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 643674523 - 2⁵ = 643674491 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (643674503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 95323 + ... + 101851.

It is an arithmetic number, because the mean of its divisors is an integer number (80985060).

Almost surely, 2^643674523 is an apocalyptic number.

643674523 is a deficient number, since it is larger than the sum of its proper divisors (4205957).

643674523 is a wasteful number, since it uses less digits than its factorization.

643674523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7157.

The product of its digits is 362880, while the sum is 40.

The square root of 643674523 is about 25370.7414751717. The cubic root of 643674523 is about 863.4200045993.

The spelling of 643674523 in words is "six hundred forty-three million, six hundred seventy-four thousand, five hundred twenty-three".