28540013402881 has 4 divisors (see below), whose sum is σ = 28557619828564. Its totient is φ = 28522406977200.

The previous prime is 28540013402843. The next prime is 28540013402939. The reversal of 28540013402881 is 18820431004582.

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 19173714288400 + 9366299114481 = 4378780^2 + 3060441^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28540013402881 is a prime.

It is a super-2 number, since 2×28540013402881² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28540013402081) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8803210410 + ... + 8803213651.

It is an arithmetic number, because the mean of its divisors is an integer number (7139404957141).

Almost surely, 2^{28540013402881} is an apocalyptic number.

It is an amenable number.

28540013402881 is a deficient number, since it is larger than the sum of its proper divisors (17606425683).

28540013402881 is a wasteful number, since it uses less digits than its factorization.

28540013402881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17606425682.

The product of its (nonzero) digits is 491520, while the sum is 46.

The spelling of 28540013402881 in words is "twenty-eight trillion, five hundred forty billion, thirteen million, four hundred two thousand, eight hundred eighty-one".