643467 has 32 divisors (see below), whose sum is σ = 1050624. Its totient is φ = 345600.

The previous prime is 643463. The next prime is 643469. The reversal of 643467 is 764346.

643467 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 643467 - 2² = 643463 is a prime.

It is an Ulam number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 643467.

It is not an unprimeable number, because it can be changed into a prime (643463) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 17373 + ... + 17409.

It is an arithmetic number, because the mean of its divisors is an integer number (32832).

2⁶⁴³⁴⁶⁷ is an apocalyptic number.

643467 is a deficient number, since it is larger than the sum of its proper divisors (407157).

643467 is a wasteful number, since it uses less digits than its factorization.

With its successor (643468) it forms a Ruth-Aaron pair, since the sum of their prime factors is the same (99).

643467 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99.

The product of its digits is 12096, while the sum is 30.

The square root of 643467 is about 802.1639483298. The cubic root of 643467 is about 86.3327204712.

The spelling of 643467 in words is "six hundred forty-three thousand, four hundred sixty-seven".