643484 has 12 divisors (see below), whose sum is σ = 1192464. Its totient is φ = 302784.

The previous prime is 643469. The next prime is 643493. The reversal of 643484 is 484346.

643484 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

643484 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4664 + ... + 4799.

It is an arithmetic number, because the mean of its divisors is an integer number (99372).

2⁶⁴³⁴⁸⁴ is an apocalyptic number.

It is an amenable number.

643484 is a deficient number, since it is larger than the sum of its proper divisors (548980).

643484 is a wasteful number, since it uses less digits than its factorization.

643484 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9484 (or 9482 counting only the distinct ones).

The product of its digits is 9216, while the sum is 29.

The square root of 643484 is about 802.1745445974. The cubic root of 643484 is about 86.3334807502. Note that the first 3 decimals are identical.

The spelling of 643484 in words is "six hundred forty-three thousand, four hundred eighty-four".