28055866331 has 2 divisors, whose sum is σ = 28055866332. Its totient is φ = 28055866330.

The previous prime is 28055866313. The next prime is 28055866351. The reversal of 28055866331 is 13366855082.

Together with previous prime (28055866313) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28055866331 - 2¹⁴ = 28055849947 is a prime.

It is a super-2 number, since 2×28055866331² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (28055866351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14027933165 + 14027933166.

It is an arithmetic number, because the mean of its divisors is an integer number (14027933166).

Almost surely, 2^28055866331 is an apocalyptic number.

28055866331 is a deficient number, since it is larger than the sum of its proper divisors (1).

28055866331 is an equidigital number, since it uses as much as digits as its factorization.

28055866331 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1036800, while the sum is 47.

The spelling of 28055866331 in words is "twenty-eight billion, fifty-five million, eight hundred sixty-six thousand, three hundred thirty-one".