28400569 has 2 divisors, whose sum is σ = 28400570. Its totient is φ = 28400568.

The previous prime is 28400543. The next prime is 28400587. The reversal of 28400569 is 96500482.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28355625 + 44944 = 5325^2 + 212^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28400569 is a prime.

It is a super-2 number, since 2×28400569² = 1613184639047522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (28400539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14200284 + 14200285.

It is an arithmetic number, because the mean of its divisors is an integer number (14200285).

Almost surely, 2^28400569 is an apocalyptic number.

It is an amenable number.

28400569 is a deficient number, since it is larger than the sum of its proper divisors (1).

28400569 is an equidigital number, since it uses as much as digits as its factorization.

28400569 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17280, while the sum is 34.

The square root of 28400569 is about 5329.2184229960. The cubic root of 28400569 is about 305.1000979345.

The spelling of 28400569 in words is "twenty-eight million, four hundred thousand, five hundred sixty-nine".