2028871849 has 9 divisors (see below), whose sum is σ = 2097874359. Its totient is φ = 1962073080.

The previous prime is 2028871847. The next prime is 2028871877. The reversal of 2028871849 is 9481788202.

The square root of 2028871849 is 45043.

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., 1978915225 + 49956624 = 44485^2 + 7068^2 .

It is not a de Polignac number, because 2028871849 - 2¹ = 2028871847 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2028871841) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1395607 + ... + 1397059.

It is an arithmetic number, because the mean of its divisors is an integer number (233097151).

Almost surely, 2^2028871849 is an apocalyptic number.

2028871849 is the 45043-rd square number.

2028871849 is the 22522-nd centered octagonal number.

It is an amenable number.

2028871849 is a deficient number, since it is larger than the sum of its proper divisors (69002510).

2028871849 is an frugal number, since it uses more digits than its factorization.

2028871849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2968 (or 1484 counting only the distinct ones).

The product of its (nonzero) digits is 516096, while the sum is 49.

The cubic root of 2028871849 is about 1265.9548164217.

Multiplying 2028871849 by its sum of digits (49), we get a square (99414720601 = 315301²).

The spelling of 2028871849 in words is "two billion, twenty-eight million, eight hundred seventy-one thousand, eight hundred forty-nine".