728261272565 has 8 divisors (see below), whose sum is σ = 902104286208. Its totient is φ = 563815178640.

The previous prime is 728261272537. The next prime is 728261272601. The reversal of 728261272565 is 565272162827.

It is a happy number.

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

It is not a de Polignac number, because 728261272565 - 2⁸ = 728261272309 is a prime.

It is a super-2 number, since 2×728261272565² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2349229757 + ... + 2349230066.

It is an arithmetic number, because the mean of its divisors is an integer number (112763035776).

Almost surely, 2^728261272565 is an apocalyptic number.

It is an amenable number.

728261272565 is a deficient number, since it is larger than the sum of its proper divisors (173843013643).

728261272565 is a wasteful number, since it uses less digits than its factorization.

728261272565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4698459859.

The product of its digits is 5644800, while the sum is 53.

The spelling of 728261272565 in words is "seven hundred twenty-eight billion, two hundred sixty-one million, two hundred seventy-two thousand, five hundred sixty-five".