28881544 has 16 divisors (see below), whose sum is σ = 54216720. Its totient is φ = 14423760.

The previous prime is 28881527. The next prime is 28881551. The reversal of 28881544 is 44518882.

It is a junction number, because it is equal to n+sod(n) for n = 28881497 and 28881506.

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 in 3 ways as a sum of consecutive naturals, for example, 7827 + ... + 10909.

It is an arithmetic number, because the mean of its divisors is an integer number (3388545).

Almost surely, 2^28881544 is an apocalyptic number.

It is an amenable number.

28881544 is a deficient number, since it is larger than the sum of its proper divisors (25335176).

28881544 is a wasteful number, since it uses less digits than its factorization.

28881544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4260 (or 4256 counting only the distinct ones).

The product of its digits is 81920, while the sum is 40.

The square root of 28881544 is about 5374.1551894228. The cubic root of 28881544 is about 306.8127963512.

The spelling of 28881544 in words is "twenty-eight million, eight hundred eighty-one thousand, five hundred forty-four".