28239308 has 12 divisors (see below), whose sum is σ = 51567600. Its totient is φ = 13505712.

The previous prime is 28239307. The next prime is 28239317. The reversal of 28239308 is 80393282.

It is not an unprimeable number, because it can be changed into a prime (28239307) 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, 153383 + ... + 153566.

It is an arithmetic number, because the mean of its divisors is an integer number (4297300).

Almost surely, 2^28239308 is an apocalyptic number.

It is an amenable number.

28239308 is a deficient number, since it is larger than the sum of its proper divisors (23328292).

28239308 is a wasteful number, since it uses less digits than its factorization.

28239308 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 306976 (or 306974 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 35.

The square root of 28239308 is about 5314.0669924268. The cubic root of 28239308 is about 304.5215395277.

The spelling of 28239308 in words is "twenty-eight million, two hundred thirty-nine thousand, three hundred eight".