643283 has 4 divisors (see below), whose sum is σ = 677160. Its totient is φ = 609408.

The previous prime is 643273. The next prime is 643301. The reversal of 643283 is 382346.

643283 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 382346 = 2 ⋅191173.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-643283 is a prime.

It is not an unprimeable number, because it can be changed into a prime (643213) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16910 + ... + 16947.

It is an arithmetic number, because the mean of its divisors is an integer number (169290).

2⁶⁴³²⁸³ is an apocalyptic number.

643283 is a deficient number, since it is larger than the sum of its proper divisors (33877).

643283 is a wasteful number, since it uses less digits than its factorization.

643283 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33876.

The product of its digits is 3456, while the sum is 26.

The square root of 643283 is about 802.0492503581. The cubic root of 643283 is about 86.3244907123.

The spelling of 643283 in words is "six hundred forty-three thousand, two hundred eighty-three".