643592 has 8 divisors (see below), whose sum is σ = 1206750. Its totient is φ = 321792.

The previous prime is 643589. The next prime is 643619. The reversal of 643592 is 295346.

643592 is nontrivially palindromic in base 7.

It can be written as a sum of positive squares in only one way, i.e., 568516 + 75076 = 754^2 + 274^2 .

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

It is a nialpdrome in base 15.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 643592.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40217 + ... + 40232.

2⁶⁴³⁵⁹² is an apocalyptic number.

It is an amenable number.

643592 is a deficient number, since it is larger than the sum of its proper divisors (563158).

643592 is a wasteful number, since it uses less digits than its factorization.

643592 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80455 (or 80451 counting only the distinct ones).

The product of its digits is 6480, while the sum is 29.

The square root of 643592 is about 802.2418587932. The cubic root of 643592 is about 86.3383104452.

The spelling of 643592 in words is "six hundred forty-three thousand, five hundred ninety-two".