28540077481 has 8 divisors (see below), whose sum is σ = 28752925320. Its totient is φ = 28327623168.

The previous prime is 28540077451. The next prime is 28540077509. The reversal of 28540077481 is 18477004582.

It can be written as a sum of positive squares in 4 ways, for example, as 4055651856 + 24484425625 = 63684^2 + 156475^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28540077481 - 2¹⁵ = 28540044713 is a prime.

It is a super-2 number, since 2×28540077481² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28540077451) 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 7 ways as a sum of consecutive naturals, for example, 48015 + ... + 243691.

It is an arithmetic number, because the mean of its divisors is an integer number (3594115665).

Almost surely, 2^28540077481 is an apocalyptic number.

It is an amenable number.

28540077481 is a deficient number, since it is larger than the sum of its proper divisors (212847839).

28540077481 is a wasteful number, since it uses less digits than its factorization.

28540077481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 196763.

The product of its (nonzero) digits is 501760, while the sum is 46.

The spelling of 28540077481 in words is "twenty-eight billion, five hundred forty million, seventy-seven thousand, four hundred eighty-one".