28000069 has 2 divisors, whose sum is σ = 28000070. Its totient is φ = 28000068.

The previous prime is 28000061. The next prime is 28000073. The reversal of 28000069 is 96000082.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16507969 + 11492100 = 4063^2 + 3390^2 .

It is a cyclic number.

It is not a de Polignac number, because 28000069 - 2³ = 28000061 is a prime.

It is a super-2 number, since 2×28000069² = 1568007728009522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28000061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14000034 + 14000035.

It is an arithmetic number, because the mean of its divisors is an integer number (14000035).

Almost surely, 2^28000069 is an apocalyptic number.

It is an amenable number.

28000069 is a deficient number, since it is larger than the sum of its proper divisors (1).

28000069 is an equidigital number, since it uses as much as digits as its factorization.

28000069 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 28000069 is about 5291.5091420123. The cubic root of 28000069 is about 303.6591466215.

The spelling of 28000069 in words is "twenty-eight million, sixty-nine", and thus it is an aban number and an uban number.