1028108797849 has 15 divisors (see below), whose sum is σ = 1199446861343. Its totient is φ = 881193526248.

The previous prime is 1028108797847. The next prime is 1028108797867. The reversal of 1028108797849 is 9487978018201.

The square root of 1028108797849 is 1013957.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 925665273225 + 102443524624 = 962115^2 + 320068^2 .

It is not a de Polignac number, because 1028108797849 - 2¹ = 1028108797847 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1028108797843) by changing a digit.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 49673547 + ... + 49694239.

Almost surely, 2^{1028108797849} is an apocalyptic number.

1028108797849 is the 1013957-th square number.

1028108797849 is the 506979-th centered octagonal number.

It is an amenable number.

1028108797849 is a deficient number, since it is larger than the sum of its proper divisors (171338063494).

1028108797849 is an frugal number, since it uses more digits than its factorization.

1028108797849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41414 (or 20700 counting only the distinct ones).

The product of its (nonzero) digits is 16257024, while the sum is 64.

Multiplying 1028108797849 by its sum of digits (64), we get a square (65798963062336 = 8111656²).

The spelling of 1028108797849 in words is "one trillion, twenty-eight billion, one hundred eight million, seven hundred ninety-seven thousand, eight hundred forty-nine".