643724054 has 8 divisors (see below), whose sum is σ = 966056328. Its totient is φ = 321705280.

The previous prime is 643724051. The next prime is 643724063. The reversal of 643724054 is 450427346.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643724051) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 73172 + ... + 81495.

It is an arithmetic number, because the mean of its divisors is an integer number (120757041).

Almost surely, 2^643724054 is an apocalyptic number.

643724054 is a deficient number, since it is larger than the sum of its proper divisors (322332274).

643724054 is a wasteful number, since it uses less digits than its factorization.

643724054 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156750.

The product of its (nonzero) digits is 80640, while the sum is 35.

The square root of 643724054 is about 25371.7176005094. The cubic root of 643724054 is about 863.4421508642.

The spelling of 643724054 in words is "six hundred forty-three million, seven hundred twenty-four thousand, fifty-four".