643441350 has 24 divisors (see below), whose sum is σ = 1595734920. Its totient is φ = 171584320.

The previous prime is 643441339. The next prime is 643441367. The reversal of 643441350 is 53144346.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2144655 + ... + 2144954.

It is an arithmetic number, because the mean of its divisors is an integer number (66488955).

Almost surely, 2^643441350 is an apocalyptic number.

643441350 is an abundant number, since it is smaller than the sum of its proper divisors (952293570).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

643441350 is a wasteful number, since it uses less digits than its factorization.

643441350 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4289624 (or 4289619 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 30.

The square root of 643441350 is about 25366.1457458558. The cubic root of 643441350 is about 863.3157331905.

Adding to 643441350 its reverse (53144346), we get a palindrome (696585696).

The spelling of 643441350 in words is "six hundred forty-three million, four hundred forty-one thousand, three hundred fifty".