28872372449 has 4 divisors (see below), whose sum is σ = 28872726036. Its totient is φ = 28872018864.

The previous prime is 28872372437. The next prime is 28872372457. The reversal of 28872372449 is 94427327882.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 16187981824 + 12684390625 = 127232^2 + 112625^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28872372449 is a prime.

It is a super-2 number, since 2×28872372449² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28872372394 and 28872372403.

It is not an unprimeable number, because it can be changed into a prime (28872372349) 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 3 ways as a sum of consecutive naturals, for example, 15167 + ... + 240779.

It is an arithmetic number, because the mean of its divisors is an integer number (7218181509).

Almost surely, 2^28872372449 is an apocalyptic number.

It is an amenable number.

28872372449 is a deficient number, since it is larger than the sum of its proper divisors (353587).

28872372449 is a wasteful number, since it uses less digits than its factorization.

28872372449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 353586.

The product of its digits is 10838016, while the sum is 56.

The spelling of 28872372449 in words is "twenty-eight billion, eight hundred seventy-two million, three hundred seventy-two thousand, four hundred forty-nine".