28181324 has 6 divisors (see below), whose sum is σ = 49317324. Its totient is φ = 14090660.

The previous prime is 28181317. The next prime is 28181347. The reversal of 28181324 is 42318182.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3522662 + ... + 3522669.

It is an arithmetic number, because the mean of its divisors is an integer number (8219554).

Almost surely, 2^28181324 is an apocalyptic number.

It is an amenable number.

28181324 is a deficient number, since it is larger than the sum of its proper divisors (21136000).

28181324 is a wasteful number, since it uses less digits than its factorization.

28181324 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7045335 (or 7045333 counting only the distinct ones).

The product of its digits is 3072, while the sum is 29.

The square root of 28181324 is about 5308.6084805719. The cubic root of 28181324 is about 304.3129711957.

The spelling of 28181324 in words is "twenty-eight million, one hundred eighty-one thousand, three hundred twenty-four".