729615731 has 8 divisors (see below), whose sum is σ = 787724784. Its totient is φ = 671790240.

The previous prime is 729615709. The next prime is 729615737. The reversal of 729615731 is 137516927.

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 729615731 - 2¹⁴ = 729599347 is a prime.

It is a super-2 number, since 2×729615731² = 1064678229845328722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (729615737) 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, 65525 + ... + 75846.

It is an arithmetic number, because the mean of its divisors is an integer number (98465598).

Almost surely, 2^729615731 is an apocalyptic number.

729615731 is a deficient number, since it is larger than the sum of its proper divisors (58109053).

729615731 is a wasteful number, since it uses less digits than its factorization.

729615731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141781.

The product of its digits is 79380, while the sum is 41.

The square root of 729615731 is about 27011.4000192511. The cubic root of 729615731 is about 900.2533159373.

The spelling of 729615731 in words is "seven hundred twenty-nine million, six hundred fifteen thousand, seven hundred thirty-one".