28381946 has 8 divisors (see below), whose sum is σ = 42609504. Its totient is φ = 14178780.

The previous prime is 28381939. The next prime is 28381973. The reversal of 28381946 is 64918382.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2840 + ... + 8051.

It is an arithmetic number, because the mean of its divisors is an integer number (5326188).

Almost surely, 2^28381946 is an apocalyptic number.

28381946 is a deficient number, since it is larger than the sum of its proper divisors (14227558).

28381946 is a wasteful number, since it uses less digits than its factorization.

28381946 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12196.

The product of its digits is 82944, while the sum is 41.

The square root of 28381946 is about 5327.4708821353. The cubic root of 28381946 is about 305.0333959669.

The spelling of 28381946 in words is "twenty-eight million, three hundred eighty-one thousand, nine hundred forty-six".