643415450 has 48 divisors (see below), whose sum is σ = 1237126176. Its totient is φ = 248808000.

The previous prime is 643415441. The next prime is 643415467. The reversal of 643415450 is 54514346.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 215669 + ... + 218631.

It is an arithmetic number, because the mean of its divisors is an integer number (25773462).

Almost surely, 2^643415450 is an apocalyptic number.

643415450 is a deficient number, since it is larger than the sum of its proper divisors (593710726).

643415450 is a wasteful number, since it uses less digits than its factorization.

643415450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3119 (or 3114 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 32.

The square root of 643415450 is about 25365.6352177508. The cubic root of 643415450 is about 863.3041495512.

Adding to 643415450 its reverse (54514346), we get a palindrome (697929796).

The spelling of 643415450 in words is "six hundred forty-three million, four hundred fifteen thousand, four hundred fifty".