28829662849 has 27 divisors (see below), whose sum is σ = 32175598203. Its totient is φ = 25819402752.

The previous prime is 28829662783. The next prime is 28829662853. The reversal of 28829662849 is 94826692882.

The square root of 28829662849 is 169793.

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

It can be written as a sum of positive squares in 13 ways, for example, as 15273252225 + 13556410624 = 123585^2 + 116432^2 .

It is not a de Polignac number, because 28829662849 - 2¹¹ = 28829660801 is a prime.

It is a super-2 number, since 2×28829662849² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28829662349) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 81670257 + ... + 81670609.

Almost surely, 2^28829662849 is an apocalyptic number.

28829662849 is the 169793-rd square number.

28829662849 is the 84897-th centered octagonal number.

It is an amenable number.

28829662849 is a deficient number, since it is larger than the sum of its proper divisors (3345935354).

28829662849 is an frugal number, since it uses more digits than its factorization.

28829662849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 806 (or 403 counting only the distinct ones).

The product of its digits is 47775744, while the sum is 64.

Multiplying 28829662849 by its sum of digits (64), we get a square (1845098422336 = 1358344²).

The spelling of 28829662849 in words is "twenty-eight billion, eight hundred twenty-nine million, six hundred sixty-two thousand, eight hundred forty-nine".