643460408 has 8 divisors (see below), whose sum is σ = 1206488280. Its totient is φ = 321730200.

The previous prime is 643460407. The next prime is 643460423. The reversal of 643460408 is 804064346.

It is a happy number.

643460408 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643460407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40216268 + ... + 40216283.

It is an arithmetic number, because the mean of its divisors is an integer number (150811035).

Almost surely, 2^643460408 is an apocalyptic number.

It is an amenable number.

643460408 is a deficient number, since it is larger than the sum of its proper divisors (563027872).

643460408 is a wasteful number, since it uses less digits than its factorization.

643460408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80432557 (or 80432553 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 35.

The square root of 643460408 is about 25366.5214012485. The cubic root of 643460408 is about 863.3242565826.

The spelling of 643460408 in words is "six hundred forty-three million, four hundred sixty thousand, four hundred eight".