28381156 has 6 divisors (see below), whose sum is σ = 49667030. Its totient is φ = 14190576.

The previous prime is 28381147. The next prime is 28381163. The reversal of 28381156 is 65118382.

It can be written as a sum of positive squares in only one way, i.e., 14318656 + 14062500 = 3784^2 + 3750^2 .

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 as a sum of consecutive naturals, namely, 3547641 + ... + 3547648.

Almost surely, 2^28381156 is an apocalyptic number.

It is an amenable number.

28381156 is a deficient number, since it is larger than the sum of its proper divisors (21285874).

28381156 is a wasteful number, since it uses less digits than its factorization.

28381156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7095293 (or 7095291 counting only the distinct ones).

The product of its digits is 11520, while the sum is 34.

The square root of 28381156 is about 5327.3967376196. The cubic root of 28381156 is about 305.0305657802.

The spelling of 28381156 in words is "twenty-eight million, three hundred eighty-one thousand, one hundred fifty-six".