33428009 has 2 divisors, whose sum is σ = 33428010. Its totient is φ = 33428008.

The previous prime is 33427991. The next prime is 33428023. The reversal of 33428009 is 90082433.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 29539225 + 3888784 = 5435^2 + 1972^2 .

It is a cyclic number.

It is not a de Polignac number, because 33428009 - 2⁸ = 33427753 is a prime.

It is a super-2 number, since 2×33428009² = 2234863571408162, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (33478009) 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, 16714004 + 16714005.

It is an arithmetic number, because the mean of its divisors is an integer number (16714005).

Almost surely, 2^33428009 is an apocalyptic number.

It is an amenable number.

33428009 is a deficient number, since it is larger than the sum of its proper divisors (1).

33428009 is an equidigital number, since it uses as much as digits as its factorization.

33428009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 33428009 is about 5781.6960314427. The cubic root of 33428009 is about 322.1342013551.

The spelling of 33428009 in words is "thirty-three million, four hundred twenty-eight thousand, nine".