28243155249 has 45 divisors (see below), whose sum is σ = 42956322409. Its totient is φ = 18492992280.

The previous prime is 28243155229. The next prime is 28243155271. The reversal of 28243155249 is 94255134282.

The square root of 28243155249 is 168057.

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

28243155249 is a `hidden beast` number, since 2 + 8 + 24 + 31 + 552 + 49 = 666.

It is not a de Polignac number, because 28243155249 - 2⁵ = 28243155217 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28243155229) 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 44 ways as a sum of consecutive naturals, for example, 107388292 + ... + 107388554.

Almost surely, 2^28243155249 is an apocalyptic number.

28243155249 is the 168057-th square number.

28243155249 is the 84029-th centered octagonal number.

It is an amenable number.

28243155249 is a deficient number, since it is larger than the sum of its proper divisors (14713167160).

28243155249 is an frugal number, since it uses more digits than its factorization.

28243155249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 680 (or 337 counting only the distinct ones).

The product of its digits is 691200, while the sum is 45.

The spelling of 28243155249 in words is "twenty-eight billion, two hundred forty-three million, one hundred fifty-five thousand, two hundred forty-nine".