28531457552 has 60 divisors (see below), whose sum is σ = 60098572716. Its totient is φ = 13044207360.

The previous prime is 28531457551. The next prime is 28531457587. The reversal of 28531457552 is 25575413582.

It can be written as a sum of positive squares in 2 ways, for example, as 17264908816 + 11266548736 = 131396^2 + 106144^2 .

It is a junction number, because it is equal to n+sod(n) for n = 28531457497 and 28531457506.

It is not an unprimeable number, because it can be changed into a prime (28531457551) 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 11 ways as a sum of consecutive naturals, for example, 2375402 + ... + 2387382.

Almost surely, 2^28531457552 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28531457552, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30049286358).

28531457552 is an abundant number, since it is smaller than the sum of its proper divisors (31567115164).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28531457552 is a wasteful number, since it uses less digits than its factorization.

28531457552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12216 (or 12103 counting only the distinct ones).

The product of its digits is 1680000, while the sum is 47.

The spelling of 28531457552 in words is "twenty-eight billion, five hundred thirty-one million, four hundred fifty-seven thousand, five hundred fifty-two".