28604729 has 2 divisors, whose sum is σ = 28604730. Its totient is φ = 28604728.

The previous prime is 28604699. The next prime is 28604749. The reversal of 28604729 is 92740682.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28334329 + 270400 = 5323^2 + 520^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28604729 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 28604692 and 28604701.

It is not a weakly prime, because it can be changed into another prime (28604749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14302364 + 14302365.

It is an arithmetic number, because the mean of its divisors is an integer number (14302365).

Almost surely, 2^28604729 is an apocalyptic number.

It is an amenable number.

28604729 is a deficient number, since it is larger than the sum of its proper divisors (1).

28604729 is an equidigital number, since it uses as much as digits as its factorization.

28604729 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48384, while the sum is 38.

The square root of 28604729 is about 5348.3389010047. The cubic root of 28604729 is about 305.8294327588.

The spelling of 28604729 in words is "twenty-eight million, six hundred four thousand, seven hundred twenty-nine".