28609013 has 2 divisors, whose sum is σ = 28609014. Its totient is φ = 28609012.

The previous prime is 28608991. The next prime is 28609019. The reversal of 28609013 is 31090682.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28121809 + 487204 = 5303^2 + 698^2 .

It is a cyclic number.

It is not a de Polignac number, because 28609013 - 2⁶ = 28608949 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28609019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14304506 + 14304507.

It is an arithmetic number, because the mean of its divisors is an integer number (14304507).

Almost surely, 2^28609013 is an apocalyptic number.

It is an amenable number.

28609013 is a deficient number, since it is larger than the sum of its proper divisors (1).

28609013 is an equidigital number, since it uses as much as digits as its factorization.

28609013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 28609013 is about 5348.7393841914. The cubic root of 28609013 is about 305.8446995572.

Adding to 28609013 its reverse (31090682), we get a palindrome (59699695).

The spelling of 28609013 in words is "twenty-eight million, six hundred nine thousand, thirteen".