28308855 has 16 divisors (see below), whose sum is σ = 45560160. Its totient is φ = 15009408.

The previous prime is 28308851. The next prime is 28308857. The reversal of 28308855 is 55880382.

It is not a de Polignac number, because 28308855 - 2² = 28308851 is a prime.

It is a super-2 number, since 2×28308855² = 1602782542822050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28308851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2860 + ... + 8049.

It is an arithmetic number, because the mean of its divisors is an integer number (2847510).

Almost surely, 2^28308855 is an apocalyptic number.

28308855 is a deficient number, since it is larger than the sum of its proper divisors (17251305).

28308855 is a wasteful number, since it uses less digits than its factorization.

28308855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11090.

The product of its (nonzero) digits is 76800, while the sum is 39.

The square root of 28308855 is about 5320.6066383449. The cubic root of 28308855 is about 304.7713237087.

The spelling of 28308855 in words is "twenty-eight million, three hundred eight thousand, eight hundred fifty-five".