28308633 has 4 divisors (see below), whose sum is σ = 37744848. Its totient is φ = 18872420.

The previous prime is 28308629. The next prime is 28308649. The reversal of 28308633 is 33680382.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 28308633 - 2² = 28308629 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28308594 and 28308603.

It is not an unprimeable number, because it can be changed into a prime (28308733) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4718103 + ... + 4718108.

It is an arithmetic number, because the mean of its divisors is an integer number (9436212).

Almost surely, 2^28308633 is an apocalyptic number.

It is an amenable number.

28308633 is a deficient number, since it is larger than the sum of its proper divisors (9436215).

28308633 is an equidigital number, since it uses as much as digits as its factorization.

28308633 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9436214.

The product of its (nonzero) digits is 20736, while the sum is 33.

The square root of 28308633 is about 5320.5857760213. The cubic root of 28308633 is about 304.7705270273.

The spelling of 28308633 in words is "twenty-eight million, three hundred eight thousand, six hundred thirty-three".