28555069 has 2 divisors, whose sum is σ = 28555070. Its totient is φ = 28555068.

The previous prime is 28555063. The next prime is 28555091. The reversal of 28555069 is 96055582.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26112100 + 2442969 = 5110^2 + 1563^2 .

It is a cyclic number.

It is not a de Polignac number, because 28555069 - 2⁷ = 28554941 is a prime.

It is a super-2 number, since 2×28555069² = 1630783931189522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28555063) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14277534 + 14277535.

It is an arithmetic number, because the mean of its divisors is an integer number (14277535).

Almost surely, 2^28555069 is an apocalyptic number.

It is an amenable number.

28555069 is a deficient number, since it is larger than the sum of its proper divisors (1).

28555069 is an equidigital number, since it uses as much as digits as its factorization.

28555069 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108000, while the sum is 40.

The square root of 28555069 is about 5343.6943213474. The cubic root of 28555069 is about 305.6523491375.

The spelling of 28555069 in words is "twenty-eight million, five hundred fifty-five thousand, sixty-nine".