729636 has 24 divisors (see below), whose sum is σ = 1745184. Its totient is φ = 237120.

The previous prime is 729613. The next prime is 729637. The reversal of 729636 is 636927.

It is an alternating number because its digits alternate between odd and even.

It is a junction number, because it is equal to n+sod(n) for n = 729597 and 729606.

It is not an unprimeable number, because it can be changed into a prime (729637) by changing a digit.

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 in 7 ways as a sum of consecutive naturals, for example, 250 + ... + 1233.

It is an arithmetic number, because the mean of its divisors is an integer number (72716).

2⁷²⁹⁶³⁶ is an apocalyptic number.

It is an amenable number.

729636 is an abundant number, since it is smaller than the sum of its proper divisors (1015548).

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

729636 is a wasteful number, since it uses less digits than its factorization.

729636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1531 (or 1529 counting only the distinct ones).

The product of its digits is 13608, while the sum is 33.

The square root of 729636 is about 854.1873330833. The cubic root of 729636 is about 90.0261652319.

The spelling of 729636 in words is "seven hundred twenty-nine thousand, six hundred thirty-six".