28178282 has 32 divisors (see below), whose sum is σ = 49688640. Its totient is φ = 11841280.

The previous prime is 28178281. The next prime is 28178291. The reversal of 28178282 is 28287182.

It is not an unprimeable number, because it can be changed into a prime (28178281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21428 + ... + 22704.

It is an arithmetic number, because the mean of its divisors is an integer number (1552770).

Almost surely, 2^28178282 is an apocalyptic number.

28178282 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

28178282 is a deficient number, since it is larger than the sum of its proper divisors (21510358).

28178282 is a wasteful number, since it uses less digits than its factorization.

28178282 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1366.

The product of its digits is 28672, while the sum is 38.

The square root of 28178282 is about 5308.3219570783. The cubic root of 28178282 is about 304.3020212326.

Subtracting 28178282 from its reverse (28287182), we obtain a square (108900 = 330²).

The spelling of 28178282 in words is "twenty-eight million, one hundred seventy-eight thousand, two hundred eighty-two".