28378386 has 24 divisors (see below), whose sum is σ = 62406864. Its totient is φ = 9317880.

The previous prime is 28378331. The next prime is 28378393. The reversal of 28378386 is 68387382.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10560 + ... + 12971.

It is an arithmetic number, because the mean of its divisors is an integer number (2600286).

Almost surely, 2^28378386 is an apocalyptic number.

28378386 is an abundant number, since it is smaller than the sum of its proper divisors (34028478).

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

28378386 is a wasteful number, since it uses less digits than its factorization.

28378386 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23606 (or 23603 counting only the distinct ones).

The product of its digits is 387072, while the sum is 45.

The square root of 28378386 is about 5327.1367543926. The cubic root of 28378386 is about 305.0206417992.

The spelling of 28378386 in words is "twenty-eight million, three hundred seventy-eight thousand, three hundred eighty-six".