729644 has 12 divisors (see below), whose sum is σ = 1293600. Its totient is φ = 360048.

The previous prime is 729643. The next prime is 729649. The reversal of 729644 is 446927.

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 729644.

It is not an unprimeable number, because it can be changed into a prime (729643) 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, 839 + ... + 1470.

It is an arithmetic number, because the mean of its divisors is an integer number (107800).

2⁷²⁹⁶⁴⁴ is an apocalyptic number.

It is an amenable number.

729644 is a deficient number, since it is larger than the sum of its proper divisors (563956).

729644 is a wasteful number, since it uses less digits than its factorization.

729644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2392 (or 2390 counting only the distinct ones).

The product of its digits is 12096, while the sum is 32.

The square root of 729644 is about 854.1920158840. The cubic root of 729644 is about 90.0264942575.

The spelling of 729644 in words is "seven hundred twenty-nine thousand, six hundred forty-four".