729138868 has 6 divisors (see below), whose sum is σ = 1275993026. Its totient is φ = 364569432.

The previous prime is 729138859. The next prime is 729138869. The reversal of 729138868 is 868831927.

It can be written as a sum of positive squares in only one way, i.e., 589615524 + 139523344 = 24282^2 + 11812^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (729138869) 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 as a sum of consecutive naturals, namely, 91142355 + ... + 91142362.

Almost surely, 2^729138868 is an apocalyptic number.

It is an amenable number.

729138868 is a deficient number, since it is larger than the sum of its proper divisors (546854158).

729138868 is a wasteful number, since it uses less digits than its factorization.

729138868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 182284721 (or 182284719 counting only the distinct ones).

The product of its digits is 1161216, while the sum is 52.

The square root of 729138868 is about 27002.5715071732. The cubic root of 729138868 is about 900.0571436968.

The spelling of 729138868 in words is "seven hundred twenty-nine million, one hundred thirty-eight thousand, eight hundred sixty-eight".