28810750261 has 2 divisors, whose sum is σ = 28810750262. Its totient is φ = 28810750260.

The previous prime is 28810750231. The next prime is 28810750273. The reversal of 28810750261 is 16205701882.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27995647761 + 815102500 = 167319^2 + 28550^2 .

It is a cyclic number.

It is not a de Polignac number, because 28810750261 - 2⁵ = 28810750229 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28810750231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14405375130 + 14405375131.

It is an arithmetic number, because the mean of its divisors is an integer number (14405375131).

Almost surely, 2^28810750261 is an apocalyptic number.

It is an amenable number.

28810750261 is a deficient number, since it is larger than the sum of its proper divisors (1).

28810750261 is an equidigital number, since it uses as much as digits as its factorization.

28810750261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 53760, while the sum is 40.

The spelling of 28810750261 in words is "twenty-eight billion, eight hundred ten million, seven hundred fifty thousand, two hundred sixty-one".