28820569 has 2 divisors, whose sum is σ = 28820570. Its totient is φ = 28820568.

The previous prime is 28820531. The next prime is 28820629. The reversal of 28820569 is 96502882.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17530969 + 11289600 = 4187^2 + 3360^2 .

It is a cyclic number.

It is not a de Polignac number, because 28820569 - 2¹¹ = 28818521 is a prime.

It is a super-2 number, since 2×28820569² = 1661250394967522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (28820269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14410284 + 14410285.

It is an arithmetic number, because the mean of its divisors is an integer number (14410285).

Almost surely, 2^28820569 is an apocalyptic number.

It is an amenable number.

28820569 is a deficient number, since it is larger than the sum of its proper divisors (1).

28820569 is an equidigital number, since it uses as much as digits as its factorization.

28820569 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 69120, while the sum is 40.

The square root of 28820569 is about 5368.4792073734. The cubic root of 28820569 is about 306.5967288266.

The spelling of 28820569 in words is "twenty-eight million, eight hundred twenty thousand, five hundred sixty-nine".