28420369 has 2 divisors, whose sum is σ = 28420370. Its totient is φ = 28420368.

The previous prime is 28420363. The next prime is 28420411. The reversal of 28420369 is 96302482.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19492225 + 8928144 = 4415^2 + 2988^2 .

It is a cyclic number.

It is not a de Polignac number, because 28420369 - 2²¹ = 26323217 is a prime.

It is a super-2 number, since 2×28420369² = 1615434748192322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (28420363) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14210184 + 14210185.

It is an arithmetic number, because the mean of its divisors is an integer number (14210185).

Almost surely, 2^28420369 is an apocalyptic number.

It is an amenable number.

28420369 is a deficient number, since it is larger than the sum of its proper divisors (1).

28420369 is an equidigital number, since it uses as much as digits as its factorization.

28420369 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20736, while the sum is 34.

The square root of 28420369 is about 5331.0757826165. The cubic root of 28420369 is about 305.1709835873.

The spelling of 28420369 in words is "twenty-eight million, four hundred twenty thousand, three hundred sixty-nine".