643496 has 16 divisors (see below), whose sum is σ = 1379040. Its totient is φ = 275760.

The previous prime is 643493. The next prime is 643507. The reversal of 643496 is 694346.

It is not an unprimeable number, because it can be changed into a prime (643493) 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, 5690 + ... + 5801.

It is an arithmetic number, because the mean of its divisors is an integer number (86190).

2⁶⁴³⁴⁹⁶ is an apocalyptic number.

It is an amenable number.

643496 is an abundant number, since it is smaller than the sum of its proper divisors (735544).

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

643496 is a wasteful number, since it uses less digits than its factorization.

643496 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11504 (or 11500 counting only the distinct ones).

The product of its digits is 15552, while the sum is 32.

The square root of 643496 is about 802.1820242314. The cubic root of 643496 is about 86.3340174097.

The spelling of 643496 in words is "six hundred forty-three thousand, four hundred ninety-six".