28378308 has 24 divisors (see below), whose sum is σ = 75675712. Its totient is φ = 8108064.

The previous prime is 28378291. The next prime is 28378313. The reversal of 28378308 is 80387382.

It is a happy number.

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, 168835 + ... + 169002.

Almost surely, 2^28378308 is an apocalyptic number.

28378308 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

28378308 is an abundant number, since it is smaller than the sum of its proper divisors (47297404).

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

28378308 is a wasteful number, since it uses less digits than its factorization.

28378308 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 337851 (or 337849 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 39.

The square root of 28378308 is about 5327.1294333815. The cubic root of 28378308 is about 305.0203623421.

The spelling of 28378308 in words is "twenty-eight million, three hundred seventy-eight thousand, three hundred eight".