728886681565 has 32 divisors (see below), whose sum is σ = 1015903549440. Its totient is φ = 491684364864.

The previous prime is 728886681563. The next prime is 728886681583. The reversal of 728886681565 is 565186688827.

It is not a de Polignac number, because 728886681565 - 2¹ = 728886681563 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 728886681494 and 728886681503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (728886681563) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1533166 + ... + 1951504.

It is an arithmetic number, because the mean of its divisors is an integer number (31746985920).

Almost surely, 2^728886681565 is an apocalyptic number.

It is an amenable number.

728886681565 is a deficient number, since it is larger than the sum of its proper divisors (287016867875).

728886681565 is a wasteful number, since it uses less digits than its factorization.

728886681565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 419161.

The product of its digits is 309657600, while the sum is 70.

The spelling of 728886681565 in words is "seven hundred twenty-eight billion, eight hundred eighty-six million, six hundred eighty-one thousand, five hundred sixty-five".