1028881728165 has 16 divisors (see below), whose sum is σ = 1647387504000. Its totient is φ = 548344675392.

The previous prime is 1028881728139. The next prime is 1028881728167. The reversal of 1028881728165 is 5618271888201.

It is not a de Polignac number, because 1028881728165 - 2⁷ = 1028881728037 is a prime.

It is a super-2 number, since 2×1028881728165² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1028881728167) 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 15 ways as a sum of consecutive naturals, for example, 24493710 + ... + 24535679.

It is an arithmetic number, because the mean of its divisors is an integer number (102961719000).

Almost surely, 2^{1028881728165} is an apocalyptic number.

1028881728165 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1028881728165 is a deficient number, since it is larger than the sum of its proper divisors (618505775835).

1028881728165 is a wasteful number, since it uses less digits than its factorization.

1028881728165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49030796.

The product of its (nonzero) digits is 3440640, while the sum is 57.

The spelling of 1028881728165 in words is "one trillion, twenty-eight billion, eight hundred eighty-one million, seven hundred twenty-eight thousand, one hundred sixty-five".