729173781 has 12 divisors (see below), whose sum is σ = 1203715552. Its totient is φ = 416670696.

The previous prime is 729173779. The next prime is 729173791. The reversal of 729173781 is 187371927.

It is not a de Polignac number, because 729173781 - 2¹ = 729173779 is a prime.

It is a super-2 number, since 2×729173781² = 1063388805795671922, 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 (729173701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5787031 + ... + 5787156.

Almost surely, 2^729173781 is an apocalyptic number.

It is an amenable number.

729173781 is a deficient number, since it is larger than the sum of its proper divisors (474541771).

729173781 is a wasteful number, since it uses less digits than its factorization.

729173781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11574200 (or 11574197 counting only the distinct ones).

The product of its digits is 148176, while the sum is 45.

The square root of 729173781 is about 27003.2179749007. The cubic root of 729173781 is about 900.0715091329.

The spelling of 729173781 in words is "seven hundred twenty-nine million, one hundred seventy-three thousand, seven hundred eighty-one".