28481228 has 12 divisors (see below), whose sum is σ = 52465560. Its totient is φ = 13491072.

The previous prime is 28481207. The next prime is 28481249. The reversal of 28481228 is 82218482.

It is an interprime number because it is at equal distance from previous prime (28481207) and next prime (28481249).

It is a super-2 number, since 2×28481228² = 1622360696775968, which contains 22 as substring.

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, 187301 + ... + 187452.

It is an arithmetic number, because the mean of its divisors is an integer number (4372130).

Almost surely, 2^28481228 is an apocalyptic number.

It is an amenable number.

28481228 is a deficient number, since it is larger than the sum of its proper divisors (23984332).

28481228 is a wasteful number, since it uses less digits than its factorization.

28481228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 374776 (or 374774 counting only the distinct ones).

The product of its digits is 16384, while the sum is 35.

The square root of 28481228 is about 5336.7806775246. The cubic root of 28481228 is about 305.3886579806.

The spelling of 28481228 in words is "twenty-eight million, four hundred eighty-one thousand, two hundred twenty-eight".