28531457441 has 4 divisors (see below), whose sum is σ = 28533880452. Its totient is φ = 28529034432.

The previous prime is 28531457413. The next prime is 28531457477. The reversal of 28531457441 is 14475413582.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 22060863841 + 6470593600 = 148529^2 + 80440^2 .

It is a cyclic number.

It is not a de Polignac number, because 28531457441 - 2²² = 28527263137 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28531457392 and 28531457401.

It is not an unprimeable number, because it can be changed into a prime (28531456441) 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, 1193756 + ... + 1217421.

It is an arithmetic number, because the mean of its divisors is an integer number (7133470113).

Almost surely, 2^28531457441 is an apocalyptic number.

It is an amenable number.

28531457441 is a deficient number, since it is larger than the sum of its proper divisors (2423011).

28531457441 is a wasteful number, since it uses less digits than its factorization.

28531457441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2423010.

The product of its digits is 537600, while the sum is 44.

The spelling of 28531457441 in words is "twenty-eight billion, five hundred thirty-one million, four hundred fifty-seven thousand, four hundred forty-one".