643547416 has 8 divisors (see below), whose sum is σ = 1206651420. Its totient is φ = 321773704.

The previous prime is 643547369. The next prime is 643547447. The reversal of 643547416 is 614745346.

It is a tau number, because it is divible by the number of its divisors (8).

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 as a sum of consecutive naturals, namely, 40221706 + ... + 40221721.

Almost surely, 2^643547416 is an apocalyptic number.

It is an amenable number.

643547416 is a deficient number, since it is larger than the sum of its proper divisors (563104004).

643547416 is a wasteful number, since it uses less digits than its factorization.

643547416 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80443433 (or 80443429 counting only the distinct ones).

The product of its digits is 241920, while the sum is 40.

The square root of 643547416 is about 25368.2363596684. The cubic root of 643547416 is about 863.3631674105.

The spelling of 643547416 in words is "six hundred forty-three million, five hundred forty-seven thousand, four hundred sixteen".