729375649 has 4 divisors (see below), whose sum is σ = 729433620. Its totient is φ = 729317680.

The previous prime is 729375613. The next prime is 729375671. The reversal of 729375649 is 946573927.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 946573927 = 13 ⋅72813379.

It can be written as a sum of positive squares in 2 ways, for example, as 85840225 + 643535424 = 9265^2 + 25368^2 .

It is a cyclic number.

It is not a de Polignac number, because 729375649 - 2⁹ = 729375137 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 729375596 and 729375605.

It is not an unprimeable number, because it can be changed into a prime (729375679) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1294 + ... + 38215.

It is an arithmetic number, because the mean of its divisors is an integer number (182358405).

Almost surely, 2^729375649 is an apocalyptic number.

It is an amenable number.

729375649 is a deficient number, since it is larger than the sum of its proper divisors (57971).

729375649 is a wasteful number, since it uses less digits than its factorization.

729375649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57970.

The product of its digits is 2857680, while the sum is 52.

The square root of 729375649 is about 27006.9555670387. The cubic root of 729375649 is about 900.1545615207.

The spelling of 729375649 in words is "seven hundred twenty-nine million, three hundred seventy-five thousand, six hundred forty-nine".