28816409 has 2 divisors, whose sum is σ = 28816410. Its totient is φ = 28816408.

The previous prime is 28816397. The next prime is 28816421. The reversal of 28816409 is 90461882.

It is a balanced prime because it is at equal distance from previous prime (28816397) and next prime (28816421).

It can be written as a sum of positive squares in only one way, i.e., 24601600 + 4214809 = 4960^2 + 2053^2 .

It is a cyclic number.

It is not a de Polignac number, because 28816409 - 2¹⁶ = 28750873 is a prime.

It is not a weakly prime, because it can be changed into another prime (28816609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14408204 + 14408205.

It is an arithmetic number, because the mean of its divisors is an integer number (14408205).

Almost surely, 2^28816409 is an apocalyptic number.

It is an amenable number.

28816409 is a deficient number, since it is larger than the sum of its proper divisors (1).

28816409 is an equidigital number, since it uses as much as digits as its factorization.

28816409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27648, while the sum is 38.

The square root of 28816409 is about 5368.0917466079. The cubic root of 28816409 is about 306.5819765876.

The spelling of 28816409 in words is "twenty-eight million, eight hundred sixteen thousand, four hundred nine".