643604254 has 8 divisors (see below), whose sum is σ = 965594448. Its totient is φ = 321739440.

The previous prime is 643604249. The next prime is 643604257. The reversal of 643604254 is 452406346.

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 (643604257) 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 3 ways as a sum of consecutive naturals, for example, 17242 + ... + 39805.

It is an arithmetic number, because the mean of its divisors is an integer number (120699306).

Almost surely, 2^643604254 is an apocalyptic number.

643604254 is a deficient number, since it is larger than the sum of its proper divisors (321990194).

643604254 is a wasteful number, since it uses less digits than its factorization.

643604254 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62690.

The product of its (nonzero) digits is 69120, while the sum is 34.

The square root of 643604254 is about 25369.3565941275. The cubic root of 643604254 is about 863.3885840257.

The spelling of 643604254 in words is "six hundred forty-three million, six hundred four thousand, two hundred fifty-four".