643614340 has 24 divisors (see below), whose sum is σ = 1353199680. Its totient is φ = 257139168.

The previous prime is 643614337. The next prime is 643614353. The reversal of 643614340 is 43416346.

It is a happy 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 7 ways as a sum of consecutive naturals, for example, 1552 + ... + 35911.

It is an arithmetic number, because the mean of its divisors is an integer number (56383320).

Almost surely, 2^643614340 is an apocalyptic number.

It is an amenable number.

643614340 is an abundant number, since it is smaller than the sum of its proper divisors (709585340).

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

643614340 is a wasteful number, since it uses less digits than its factorization.

643614340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38331 (or 38329 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 31.

The square root of 643614340 is about 25369.5553764744. Note that the first 3 decimals coincide. The cubic root of 643614340 is about 863.3930940911.

The spelling of 643614340 in words is "six hundred forty-three million, six hundred fourteen thousand, three hundred forty".