28080036581 has 8 divisors (see below), whose sum is σ = 29088120600. Its totient is φ = 27087343360.

The previous prime is 28080036571. The next prime is 28080036679. The reversal of 28080036581 is 18563008082.

It can be written as a sum of positive squares in 4 ways, for example, as 1914062500 + 26165974081 = 43750^2 + 161759^2 .

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 28080036581 - 2¹⁴ = 28080020197 is a prime.

It is a super-2 number, since 2×28080036581² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28080036571) 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 7 ways as a sum of consecutive naturals, for example, 3843986 + ... + 3851283.

It is an arithmetic number, because the mean of its divisors is an integer number (3636015075).

Almost surely, 2^28080036581 is an apocalyptic number.

It is an amenable number.

28080036581 is a deficient number, since it is larger than the sum of its proper divisors (1008084019).

28080036581 is an equidigital number, since it uses as much as digits as its factorization.

28080036581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7695399.

The product of its (nonzero) digits is 92160, while the sum is 41.

The spelling of 28080036581 in words is "twenty-eight billion, eighty million, thirty-six thousand, five hundred eighty-one".