28085366377 has 4 divisors (see below), whose sum is σ = 28086081876. Its totient is φ = 28084650880.

The previous prime is 28085366371. The next prime is 28085366383. The reversal of 28085366377 is 77366358082.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (28085366371) and next prime (28085366383).

It can be written as a sum of positive squares in 2 ways, for example, as 11649100761 + 16436265616 = 107931^2 + 128204^2 .

It is a cyclic number.

It is not a de Polignac number, because 28085366377 - 2¹⁹ = 28084842089 is a prime.

It is a super-2 number, since 2×28085366377² (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 (28085366371) 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, 295228 + ... + 378589.

It is an arithmetic number, because the mean of its divisors is an integer number (7021520469).

Almost surely, 2^28085366377 is an apocalyptic number.

It is an amenable number.

28085366377 is a deficient number, since it is larger than the sum of its proper divisors (715499).

28085366377 is an equidigital number, since it uses as much as digits as its factorization.

28085366377 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 715498.

The product of its (nonzero) digits is 10160640, while the sum is 55.

The spelling of 28085366377 in words is "twenty-eight billion, eighty-five million, three hundred sixty-six thousand, three hundred seventy-seven".