28372769 has 2 divisors, whose sum is σ = 28372770. Its totient is φ = 28372768.

The previous prime is 28372741. The next prime is 28372783. The reversal of 28372769 is 96727382.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21270544 + 7102225 = 4612^2 + 2665^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28372769 is a prime.

It is a super-2 number, since 2×28372769² = 1610028041454722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (28372709) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14186384 + 14186385.

It is an arithmetic number, because the mean of its divisors is an integer number (14186385).

Almost surely, 2^28372769 is an apocalyptic number.

It is an amenable number.

28372769 is a deficient number, since it is larger than the sum of its proper divisors (1).

28372769 is an equidigital number, since it uses as much as digits as its factorization.

28372769 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 254016, while the sum is 44.

The square root of 28372769 is about 5326.6095220130. The cubic root of 28372769 is about 305.0005159895. Note that the first 3 decimals are identical.

The spelling of 28372769 in words is "twenty-eight million, three hundred seventy-two thousand, seven hundred sixty-nine".