28681544 has 16 divisors (see below), whose sum is σ = 54136320. Its totient is φ = 14245200.

The previous prime is 28681531. The next prime is 28681577. The reversal of 28681544 is 44518682.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 28681498 and 28681507.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10664 + ... + 13079.

It is an arithmetic number, because the mean of its divisors is an integer number (3383520).

Almost surely, 2^28681544 is an apocalyptic number.

It is an amenable number.

28681544 is a deficient number, since it is larger than the sum of its proper divisors (25454776).

28681544 is a wasteful number, since it uses less digits than its factorization.

28681544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23900 (or 23896 counting only the distinct ones).

The product of its digits is 61440, while the sum is 38.

The square root of 28681544 is about 5355.5152879998. The cubic root of 28681544 is about 306.1029456979.

The spelling of 28681544 in words is "twenty-eight million, six hundred eighty-one thousand, five hundred forty-four".