728735429 has 4 divisors (see below), whose sum is σ = 728806476. Its totient is φ = 728664384.

The previous prime is 728735407. The next prime is 728735453. The reversal of 728735429 is 924537827.

It is a happy number.

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: 924537827 = 11981 ⋅77167.

It can be written as a sum of positive squares in 2 ways, for example, as 476243329 + 252492100 = 21823^2 + 15890^2 .

It is a cyclic number.

It is not a de Polignac number, because 728735429 - 2²⁴ = 711958213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (728735459) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16874 + ... + 41739.

It is an arithmetic number, because the mean of its divisors is an integer number (182201619).

Almost surely, 2^728735429 is an apocalyptic number.

It is an amenable number.

728735429 is a deficient number, since it is larger than the sum of its proper divisors (71047).

728735429 is a wasteful number, since it uses less digits than its factorization.

728735429 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71046.

The product of its digits is 846720, while the sum is 47.

The square root of 728735429 is about 26995.1000924242. The cubic root of 728735429 is about 899.8911098713.

The spelling of 728735429 in words is "seven hundred twenty-eight million, seven hundred thirty-five thousand, four hundred twenty-nine".