28055897 has 2 divisors, whose sum is σ = 28055898. Its totient is φ = 28055896.

The previous prime is 28055887. The next prime is 28055903. The reversal of 28055897 is 79855082.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28047616 + 8281 = 5296^2 + 91^2 .

It is a cyclic number.

It is not a de Polignac number, because 28055897 - 2⁸ = 28055641 is a prime.

It is not a weakly prime, because it can be changed into another prime (28055827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14027948 + 14027949.

It is an arithmetic number, because the mean of its divisors is an integer number (14027949).

Almost surely, 2^28055897 is an apocalyptic number.

It is an amenable number.

28055897 is a deficient number, since it is larger than the sum of its proper divisors (1).

28055897 is an equidigital number, since it uses as much as digits as its factorization.

28055897 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 201600, while the sum is 44.

The square root of 28055897 is about 5296.7817587664. The cubic root of 28055897 is about 303.8608297941.

The spelling of 28055897 in words is "twenty-eight million, fifty-five thousand, eight hundred ninety-seven".