28176409 has 2 divisors, whose sum is σ = 28176410. Its totient is φ = 28176408.

The previous prime is 28176367. The next prime is 28176431. The reversal of 28176409 is 90467182.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23068809 + 5107600 = 4803^2 + 2260^2 .

It is a cyclic number.

It is not a de Polignac number, because 28176409 - 2¹⁵ = 28143641 is a prime.

It is not a weakly prime, because it can be changed into another prime (28176439) 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, 14088204 + 14088205.

It is an arithmetic number, because the mean of its divisors is an integer number (14088205).

Almost surely, 2^28176409 is an apocalyptic number.

It is an amenable number.

28176409 is a deficient number, since it is larger than the sum of its proper divisors (1).

28176409 is an equidigital number, since it uses as much as digits as its factorization.

28176409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24192, while the sum is 37.

The square root of 28176409 is about 5308.1455330464. The cubic root of 28176409 is about 304.2952788022.

The spelling of 28176409 in words is "twenty-eight million, one hundred seventy-six thousand, four hundred nine".