28545615481 has 2 divisors, whose sum is σ = 28545615482. Its totient is φ = 28545615480.

The previous prime is 28545615473. The next prime is 28545615493. The reversal of 28545615481 is 18451654582.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19542642025 + 9002973456 = 139795^2 + 94884^2 .

It is a cyclic number.

It is not a de Polignac number, because 28545615481 - 2³ = 28545615473 is a prime.

It is a super-2 number, since 2×28545615481² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (28545615421) 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 as a sum of consecutive naturals, namely, 14272807740 + 14272807741.

It is an arithmetic number, because the mean of its divisors is an integer number (14272807741).

Almost surely, 2^28545615481 is an apocalyptic number.

It is an amenable number.

28545615481 is a deficient number, since it is larger than the sum of its proper divisors (1).

28545615481 is an equidigital number, since it uses as much as digits as its factorization.

28545615481 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1536000, while the sum is 49.

The spelling of 28545615481 in words is "twenty-eight billion, five hundred forty-five million, six hundred fifteen thousand, four hundred eighty-one".