28426009 has 2 divisors, whose sum is σ = 28426010. Its totient is φ = 28426008.

The previous prime is 28426007. The next prime is 28426049. The reversal of 28426009 is 90062482.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27793984 + 632025 = 5272^2 + 795^2 .

It is a cyclic number.

It is not a de Polignac number, because 28426009 - 2¹ = 28426007 is a prime.

Together with 28426007, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28426007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14213004 + 14213005.

It is an arithmetic number, because the mean of its divisors is an integer number (14213005).

Almost surely, 2^28426009 is an apocalyptic number.

It is an amenable number.

28426009 is a deficient number, since it is larger than the sum of its proper divisors (1).

28426009 is an equidigital number, since it uses as much as digits as its factorization.

28426009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 28426009 is about 5331.6047302852. The cubic root of 28426009 is about 305.1911692331.

The spelling of 28426009 in words is "twenty-eight million, four hundred twenty-six thousand, nine".