28481216 has 14 divisors (see below), whose sum is σ = 56517540. Its totient is φ = 14240576.

The previous prime is 28481207. The next prime is 28481249. The reversal of 28481216 is 61218482.

It is a happy number.

It is a super-2 number, since 2×28481216² = 1622359329677312, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (32).

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, 222446 + ... + 222573.

Almost surely, 2^28481216 is an apocalyptic number.

It is an amenable number.

28481216 is a deficient number, since it is larger than the sum of its proper divisors (28036324).

28481216 is an equidigital number, since it uses as much as digits as its factorization.

28481216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 445031 (or 445021 counting only the distinct ones).

The product of its digits is 6144, while the sum is 32.

The square root of 28481216 is about 5336.7795532512. The cubic root of 28481216 is about 305.3886150908.

Adding to 28481216 its reverse (61218482), we get a palindrome (89699698).

The spelling of 28481216 in words is "twenty-eight million, four hundred eighty-one thousand, two hundred sixteen".