28087206957877 has 8 divisors (see below), whose sum is σ = 29739569403096. Its totient is φ = 26434863823872.

The previous prime is 28087206957871. The next prime is 28087206957889. The reversal of 28087206957877 is 77875960278082.

It can be written as a sum of positive squares in 4 ways, for example, as 7799335267441 + 20287871690436 = 2792729^2 + 4504206^2 .

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 28087206957877 - 2⁴³ = 19291113935669 is a prime.

It is a super-2 number, since 2×28087206957877² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28087206957871) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1778298 + ... + 7703035.

It is an arithmetic number, because the mean of its divisors is an integer number (3717446175387).

Almost surely, 2^{28087206957877} is an apocalyptic number.

It is an amenable number.

28087206957877 is a deficient number, since it is larger than the sum of its proper divisors (1652362445219).

28087206957877 is a wasteful number, since it uses less digits than its factorization.

28087206957877 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9655607.

The product of its (nonzero) digits is 1327656960, while the sum is 76.

The spelling of 28087206957877 in words is "twenty-eight trillion, eighty-seven billion, two hundred six million, nine hundred fifty-seven thousand, eight hundred seventy-seven".