643458 has 8 divisors (see below), whose sum is σ = 1286928. Its totient is φ = 214484.

The previous prime is 643457. The next prime is 643463. The reversal of 643458 is 854346.

It is a sphenic number, since it is the product of 3 distinct primes.

643458 is an admirable number.

It is a d-powerful number, because it can be written as 6² + 4³ + 4⁵ + 3¹² + 5⁷ + 8⁵ .

It is not an unprimeable number, because it can be changed into a prime (643453) 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, 53616 + ... + 53627.

It is an arithmetic number, because the mean of its divisors is an integer number (160866).

2⁶⁴³⁴⁵⁸ is an apocalyptic number.

643458 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

643458 is a wasteful number, since it uses less digits than its factorization.

643458 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107248.

The product of its digits is 11520, while the sum is 30.

The square root of 643458 is about 802.1583384844. The cubic root of 643458 is about 86.3323179652.

The spelling of 643458 in words is "six hundred forty-three thousand, four hundred fifty-eight".