28081456877 has 8 divisors (see below), whose sum is σ = 28717671960. Its totient is φ = 27449181760.

The previous prime is 28081456873. The next prime is 28081456913. The reversal of 28081456877 is 77865418082.

It can be written as a sum of positive squares in 4 ways, for example, as 5483550601 + 22597906276 = 74051^2 + 150326^2 .

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 28081456877 - 2² = 28081456873 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28081456873) 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, 970574 + ... + 999087.

It is an arithmetic number, because the mean of its divisors is an integer number (3589708995).

Almost surely, 2^28081456877 is an apocalyptic number.

It is an amenable number.

28081456877 is a deficient number, since it is larger than the sum of its proper divisors (636215083).

28081456877 is a wasteful number, since it uses less digits than its factorization.

28081456877 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1969983.

The product of its (nonzero) digits is 6021120, while the sum is 56.

The spelling of 28081456877 in words is "twenty-eight billion, eighty-one million, four hundred fifty-six thousand, eight hundred seventy-seven".