28288906 has 8 divisors (see below), whose sum is σ = 42457824. Its totient is φ = 14136300.

The previous prime is 28288903. The next prime is 28288913. The reversal of 28288906 is 60988282.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (28288903) 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, 2181 + ... + 7831.

It is an arithmetic number, because the mean of its divisors is an integer number (5307228).

Almost surely, 2^28288906 is an apocalyptic number.

28288906 is a deficient number, since it is larger than the sum of its proper divisors (14168918).

28288906 is a wasteful number, since it uses less digits than its factorization.

28288906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8156.

The product of its (nonzero) digits is 110592, while the sum is 43.

The square root of 28288906 is about 5318.7316157144. The cubic root of 28288906 is about 304.6997169995.

The spelling of 28288906 in words is "twenty-eight million, two hundred eighty-eight thousand, nine hundred six".