728805261 has 8 divisors (see below), whose sum is σ = 972152064. Its totient is φ = 485664320.

The previous prime is 728805241. The next prime is 728805263. The reversal of 728805261 is 162508827.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 728805261 - 2²¹ = 726708109 is a prime.

It is a super-2 number, since 2×728805261² = 1062314216922556242, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (728805263) 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 in 7 ways as a sum of consecutive naturals, for example, 43005 + ... + 57506.

It is an arithmetic number, because the mean of its divisors is an integer number (121519008).

Almost surely, 2^728805261 is an apocalyptic number.

It is an amenable number.

728805261 is a deficient number, since it is larger than the sum of its proper divisors (243346803).

728805261 is a wasteful number, since it uses less digits than its factorization.

728805261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102931.

The product of its (nonzero) digits is 53760, while the sum is 39.

The square root of 728805261 is about 26996.3934813523. The cubic root of 728805261 is about 899.9198533568.

The spelling of 728805261 in words is "seven hundred twenty-eight million, eight hundred five thousand, two hundred sixty-one".