643354330 has 16 divisors (see below), whose sum is σ = 1182677760. Its totient is φ = 251866192.

The previous prime is 643354319. The next prime is 643354337. The reversal of 643354330 is 33453346.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 643354292 and 643354301.

It is not an unprimeable number, because it can be changed into a prime (643354337) 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, 683950 + ... + 684889.

It is an arithmetic number, because the mean of its divisors is an integer number (73917360).

Almost surely, 2^643354330 is an apocalyptic number.

643354330 is a deficient number, since it is larger than the sum of its proper divisors (539323430).

643354330 is a wasteful number, since it uses less digits than its factorization.

643354330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1368893.

The product of its (nonzero) digits is 38880, while the sum is 31.

The square root of 643354330 is about 25364.4304095322. The cubic root of 643354330 is about 863.2768127191.

The spelling of 643354330 in words is "six hundred forty-three million, three hundred fifty-four thousand, three hundred thirty".