28918140798481 has 81 divisors (see below), whose sum is σ = 34170994057683. Its totient is φ = 24449394647040.

The previous prime is 28918140798451. The next prime is 28918140798529. The reversal of 28918140798481 is 18489704181982.

The square root of 28918140798481 is 5377559.

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

It can be written as a sum of positive squares in 13 ways, for example, as 25057623166081 + 3860517632400 = 5005759^2 + 1964820^2 .

It is not a de Polignac number, because 28918140798481 - 2¹⁵ = 28918140765713 is a prime.

It is a super-2 number, since 2×28918140798481² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28918140798481.

It is not an unprimeable number, because it can be changed into a prime (28918140798451) 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 80 ways as a sum of consecutive naturals, for example, 149834926321 + ... + 149834926513.

Almost surely, 2^{28918140798481} is an apocalyptic number.

28918140798481 is the 5377559-th square number.

28918140798481 is the 2688780-th centered octagonal number.

It is an amenable number.

28918140798481 is a deficient number, since it is larger than the sum of its proper divisors (5252853259202).

28918140798481 is an equidigital number, since it uses as much as digits as its factorization.

28918140798481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 740 (or 370 counting only the distinct ones).

The product of its (nonzero) digits is 74317824, while the sum is 70.

The spelling of 28918140798481 in words is "twenty-eight trillion, nine hundred eighteen billion, one hundred forty million, seven hundred ninety-eight thousand, four hundred eighty-one".