28677950261 has 2 divisors, whose sum is σ = 28677950262. Its totient is φ = 28677950260.

The previous prime is 28677950243. The next prime is 28677950299. The reversal of 28677950261 is 16205977682.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21020650225 + 7657300036 = 144985^2 + 87506^2 .

It is a cyclic number.

It is not a de Polignac number, because 28677950261 - 2²⁶ = 28610841397 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28677950221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14338975130 + 14338975131.

It is an arithmetic number, because the mean of its divisors is an integer number (14338975131).

Almost surely, 2^28677950261 is an apocalyptic number.

It is an amenable number.

28677950261 is a deficient number, since it is larger than the sum of its proper divisors (1).

28677950261 is an equidigital number, since it uses as much as digits as its factorization.

28677950261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2540160, while the sum is 53.

The spelling of 28677950261 in words is "twenty-eight billion, six hundred seventy-seven million, nine hundred fifty thousand, two hundred sixty-one".