28677950221 has 2 divisors, whose sum is σ = 28677950222. Its totient is φ = 28677950220.

The previous prime is 28677950167. The next prime is 28677950237. The reversal of 28677950221 is 12205977682.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22513502025 + 6164448196 = 150045^2 + 78514^2 .

It is a cyclic number.

It is not a de Polignac number, because 28677950221 - 2¹⁵ = 28677917453 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28677950261) 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, 14338975110 + 14338975111.

It is an arithmetic number, because the mean of its divisors is an integer number (14338975111).

Almost surely, 2^28677950221 is an apocalyptic number.

It is an amenable number.

28677950221 is a deficient number, since it is larger than the sum of its proper divisors (1).

28677950221 is an equidigital number, since it uses as much as digits as its factorization.

28677950221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 846720, while the sum is 49.

The spelling of 28677950221 in words is "twenty-eight billion, six hundred seventy-seven million, nine hundred fifty thousand, two hundred twenty-one".