28561069 has 2 divisors, whose sum is σ = 28561070. Its totient is φ = 28561068.

The previous prime is 28561067. The next prime is 28561111. The reversal of 28561069 is 96016582.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18404100 + 10156969 = 4290^2 + 3187^2 .

It is a cyclic number.

It is not a de Polignac number, because 28561069 - 2¹ = 28561067 is a prime.

It is a super-2 number, since 2×28561069² = 1631469324845522, which contains 22 as substring.

Together with 28561067, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28561063) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14280534 + 14280535.

It is an arithmetic number, because the mean of its divisors is an integer number (14280535).

Almost surely, 2^28561069 is an apocalyptic number.

It is an amenable number.

28561069 is a deficient number, since it is larger than the sum of its proper divisors (1).

28561069 is an equidigital number, since it uses as much as digits as its factorization.

28561069 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25920, while the sum is 37.

The square root of 28561069 is about 5344.2557012179. The cubic root of 28561069 is about 305.6737555605.

The spelling of 28561069 in words is "twenty-eight million, five hundred sixty-one thousand, sixty-nine".