729647 has 4 divisors (see below), whose sum is σ = 753216. Its totient is φ = 706080.

The previous prime is 729643. The next prime is 729649. The reversal of 729647 is 746927.

729647 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 746927 = 733 ⋅1019.

It is a cyclic number.

It is not a de Polignac number, because 729647 - 2² = 729643 is a prime.

It is a Duffinian number.

It is a plaindrome in base 6.

It is a congruent number.

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, 11738 + ... + 11799.

It is an arithmetic number, because the mean of its divisors is an integer number (188304).

2⁷²⁹⁶⁴⁷ is an apocalyptic number.

729647 is a deficient number, since it is larger than the sum of its proper divisors (23569).

729647 is a wasteful number, since it uses less digits than its factorization.

729647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23568.

The product of its digits is 21168, while the sum is 35.

The square root of 729647 is about 854.1937719277. The cubic root of 729647 is about 90.0266176414.

The spelling of 729647 in words is "seven hundred twenty-nine thousand, six hundred forty-seven".