28259963449 has 9 divisors (see below), whose sum is σ = 29546121423. Its totient is φ = 27027571032.

The previous prime is 28259963411. The next prime is 28259963461. The reversal of 28259963449 is 94436995282.

The square root of 28259963449 is 168107.

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., 12489627049 + 15770336400 = 111757^2 + 125580^2 .

It is not a de Polignac number, because 28259963449 - 2⁷ = 28259963321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28259969449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 3862807 + ... + 3870115.

Almost surely, 2^28259963449 is an apocalyptic number.

28259963449 is the 168107-th square number.

28259963449 is the 84054-th centered octagonal number.

It is an amenable number.

28259963449 is a deficient number, since it is larger than the sum of its proper divisors (1286157974).

28259963449 is an frugal number, since it uses more digits than its factorization.

28259963449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14664 (or 7332 counting only the distinct ones).

The product of its digits is 33592320, while the sum is 61.

The spelling of 28259963449 in words is "twenty-eight billion, two hundred fifty-nine million, nine hundred sixty-three thousand, four hundred forty-nine".