28180354277 has 2 divisors, whose sum is σ = 28180354278. Its totient is φ = 28180354276.

The previous prime is 28180354261. The next prime is 28180354333. The reversal of 28180354277 is 77245308182.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24320714401 + 3859639876 = 155951^2 + 62126^2 .

It is a cyclic number.

It is not a de Polignac number, because 28180354277 - 2⁴ = 28180354261 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28180354207) 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 as a sum of consecutive naturals, namely, 14090177138 + 14090177139.

It is an arithmetic number, because the mean of its divisors is an integer number (14090177139).

Almost surely, 2^28180354277 is an apocalyptic number.

It is an amenable number.

28180354277 is a deficient number, since it is larger than the sum of its proper divisors (1).

28180354277 is an equidigital number, since it uses as much as digits as its factorization.

28180354277 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 752640, while the sum is 47.

The spelling of 28180354277 in words is "twenty-eight billion, one hundred eighty million, three hundred fifty-four thousand, two hundred seventy-seven".