28380306 has 16 divisors (see below), whose sum is σ = 56813184. Its totient is φ = 9451344.

The previous prime is 28380263. The next prime is 28380343. The reversal of 28380306 is 60308382.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10375 + ... + 12821.

It is an arithmetic number, because the mean of its divisors is an integer number (3550824).

Almost surely, 2^28380306 is an apocalyptic number.

28380306 is an abundant number, since it is smaller than the sum of its proper divisors (28432878).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28380306 is a wasteful number, since it uses less digits than its factorization.

28380306 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4385.

The product of its (nonzero) digits is 6912, while the sum is 30.

The square root of 28380306 is about 5327.3169607223. The cubic root of 28380306 is about 305.0275205840.

Adding to 28380306 its reverse (60308382), we get a palindrome (88688688).

The spelling of 28380306 in words is "twenty-eight million, three hundred eighty thousand, three hundred six".