729717631 has 8 divisors (see below), whose sum is σ = 752283504. Its totient is φ = 707378880.

The previous prime is 729717551. The next prime is 729717641. The reversal of 729717631 is 136717927.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 729717631 - 2⁹ = 729717119 is a prime.

It is a super-2 number, since 2×729717631² = 1064975641984504322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (729717641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 50245 + ... + 63118.

It is an arithmetic number, because the mean of its divisors is an integer number (94035438).

Almost surely, 2^729717631 is an apocalyptic number.

729717631 is a deficient number, since it is larger than the sum of its proper divisors (22565873).

729717631 is a wasteful number, since it uses less digits than its factorization.

729717631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113561.

The product of its digits is 111132, while the sum is 43.

The square root of 729717631 is about 27013.2861940194. The cubic root of 729717631 is about 900.2952245469.

The spelling of 729717631 in words is "seven hundred twenty-nine million, seven hundred seventeen thousand, six hundred thirty-one".