729631 has 4 divisors (see below), whose sum is σ = 833872. Its totient is φ = 625392.

The previous prime is 729613. The next prime is 729637. The reversal of 729631 is 136927.

729631 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.

It is a cyclic number.

It is not a de Polignac number, because 729631 - 2⁷ = 729503 is a prime.

It is a super-2 number, since 2×729631² = 1064722792322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 729631.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (729637) 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, 52110 + ... + 52123.

It is an arithmetic number, because the mean of its divisors is an integer number (208468).

2⁷²⁹⁶³¹ is an apocalyptic number.

729631 is a deficient number, since it is larger than the sum of its proper divisors (104241).

729631 is a wasteful number, since it uses less digits than its factorization.

729631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104240.

The product of its digits is 2268, while the sum is 28.

The square root of 729631 is about 854.1844063199. The cubic root of 729631 is about 90.0259595897.

Subtracting from 729631 its reverse (136927), we obtain a cube (592704 = 84³).

The spelling of 729631 in words is "seven hundred twenty-nine thousand, six hundred thirty-one".