728642069 has 4 divisors (see below), whose sum is σ = 731129196. Its totient is φ = 726154944.

The previous prime is 728642059. The next prime is 728642087. The reversal of 728642069 is 960246827.

728642069 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 960246827 = 167 ⋅5749981.

It can be written as a sum of positive squares in 2 ways, for example, as 434931025 + 293711044 = 20855^2 + 17138^2 .

It is a cyclic number.

It is not a de Polignac number, because 728642069 - 2¹⁶ = 728576533 is a prime.

It is a super-2 number, since 2×728642069² = 1061838529433201522, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (728642059) 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, 1243124 + ... + 1243709.

It is an arithmetic number, because the mean of its divisors is an integer number (182782299).

Almost surely, 2^728642069 is an apocalyptic number.

It is an amenable number.

728642069 is a deficient number, since it is larger than the sum of its proper divisors (2487127).

728642069 is a wasteful number, since it uses less digits than its factorization.

728642069 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2487126.

The product of its (nonzero) digits is 290304, while the sum is 44.

The square root of 728642069 is about 26993.3708343363. The cubic root of 728642069 is about 899.8526791786.

The spelling of 728642069 in words is "seven hundred twenty-eight million, six hundred forty-two thousand, sixty-nine".