28948640449 has 9 divisors (see below), whose sum is σ = 29986402147. Its totient is φ = 27945647464.

The previous prime is 28948640437. The next prime is 28948640459. The reversal of 28948640449 is 94404684982.

The square root of 28948640449 is 170143.

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., 15179964849 + 13768675600 = 123207^2 + 117340^2 .

It is not a de Polignac number, because 28948640449 - 2¹¹ = 28948638401 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28948640393 and 28948640402.

It is not an unprimeable number, because it can be changed into a prime (28948640429) 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 8 ways as a sum of consecutive naturals, for example, 4931214 + ... + 4937080.

Almost surely, 2^28948640449 is an apocalyptic number.

28948640449 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

28948640449 is the 170143-rd square number.

28948640449 is the 85072-nd centered octagonal number.

It is an amenable number.

28948640449 is a deficient number, since it is larger than the sum of its proper divisors (1037761698).

28948640449 is an frugal number, since it uses more digits than its factorization.

28948640449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11792 (or 5896 counting only the distinct ones).

The product of its (nonzero) digits is 15925248, while the sum is 58.

The spelling of 28948640449 in words is "twenty-eight billion, nine hundred forty-eight million, six hundred forty thousand, four hundred forty-nine".