28404269 has 2 divisors, whose sum is σ = 28404270. Its totient is φ = 28404268.

The previous prime is 28404251. The next prime is 28404281. The reversal of 28404269 is 96240482.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19624900 + 8779369 = 4430^2 + 2963^2 .

It is a cyclic number.

It is not a de Polignac number, because 28404269 - 2¹⁶ = 28338733 is a prime.

It is a super-2 number, since 2×28404269² = 1613604994848722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28404239) 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, 14202134 + 14202135.

It is an arithmetic number, because the mean of its divisors is an integer number (14202135).

Almost surely, 2^28404269 is an apocalyptic number.

It is an amenable number.

28404269 is a deficient number, since it is larger than the sum of its proper divisors (1).

28404269 is an equidigital number, since it uses as much as digits as its factorization.

28404269 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27648, while the sum is 35.

The square root of 28404269 is about 5329.5655545269. The cubic root of 28404269 is about 305.1133467458.

The spelling of 28404269 in words is "twenty-eight million, four hundred four thousand, two hundred sixty-nine".