28056272509 has 2 divisors, whose sum is σ = 28056272510. Its totient is φ = 28056272508.

The previous prime is 28056272477. The next prime is 28056272521. The reversal of 28056272509 is 90527265082.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24893897284 + 3162375225 = 157778^2 + 56235^2 .

It is a cyclic number.

It is not a de Polignac number, because 28056272509 - 2⁵ = 28056272477 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28056279509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14028136254 + 14028136255.

It is an arithmetic number, because the mean of its divisors is an integer number (14028136255).

Almost surely, 2^28056272509 is an apocalyptic number.

It is an amenable number.

28056272509 is a deficient number, since it is larger than the sum of its proper divisors (1).

28056272509 is an equidigital number, since it uses as much as digits as its factorization.

28056272509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 604800, while the sum is 46.

The spelling of 28056272509 in words is "twenty-eight billion, fifty-six million, two hundred seventy-two thousand, five hundred nine".