729999999 has 8 divisors (see below), whose sum is σ = 1081481520. Its totient is φ = 486666648.

The previous prime is 729999971. The next prime is 730000003. The reversal of 729999999 is 999999927.

It is not a de Polignac number, because 729999999 - 2¹⁷ = 729868927 is a prime.

729999999 is a modest number, since divided by 99999 gives 7299 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (729999929) 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, 13518492 + ... + 13518545.

It is an arithmetic number, because the mean of its divisors is an integer number (135185190).

Almost surely, 2^729999999 is an apocalyptic number.

729999999 is a deficient number, since it is larger than the sum of its proper divisors (351481521).

729999999 is a wasteful number, since it uses less digits than its factorization.

729999999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27037046 (or 27037040 counting only the distinct ones).

The product of its digits is 66961566, while the sum is 72.

The square root of 729999999 is about 27018.5121537068. The cubic root of 729999999 is about 900.4113341982.

Subtracting from 729999999 its sum of digits (72), we obtain a palindrome (729999927).

The spelling of 729999999 in words is "seven hundred twenty-nine million, nine hundred ninety-nine thousand, nine hundred ninety-nine".