28328255261 has 2 divisors, whose sum is σ = 28328255262. Its totient is φ = 28328255260.

The previous prime is 28328255237. The next prime is 28328255287. The reversal of 28328255261 is 16255282382.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26606503225 + 1721752036 = 163115^2 + 41494^2 .

It is a cyclic number.

It is not a de Polignac number, because 28328255261 - 2³⁰ = 27254513437 is a prime.

It is a super-2 number, since 2×28328255261² (a number of 22 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28328285261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14164127630 + 14164127631.

It is an arithmetic number, because the mean of its divisors is an integer number (14164127631).

Almost surely, 2^28328255261 is an apocalyptic number.

It is an amenable number.

28328255261 is a deficient number, since it is larger than the sum of its proper divisors (1).

28328255261 is an equidigital number, since it uses as much as digits as its factorization.

28328255261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 460800, while the sum is 44.

The spelling of 28328255261 in words is "twenty-eight billion, three hundred twenty-eight million, two hundred fifty-five thousand, two hundred sixty-one".