28681546 has 4 divisors (see below), whose sum is σ = 43022322. Its totient is φ = 14340772.

The previous prime is 28681531. The next prime is 28681577. The reversal of 28681546 is 64518682.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 15800625 + 12880921 = 3975^2 + 3589^2 .

It is a junction number, because it is equal to n+sod(n) for n = 28681499 and 28681508.

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 as a sum of consecutive naturals, namely, 7170385 + ... + 7170388.

Almost surely, 2^28681546 is an apocalyptic number.

28681546 is a deficient number, since it is larger than the sum of its proper divisors (14340776).

28681546 is a wasteful number, since it uses less digits than its factorization.

28681546 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14340775.

The product of its digits is 92160, while the sum is 40.

The square root of 28681546 is about 5355.5154747232. The cubic root of 28681546 is about 306.1029528129.

The spelling of 28681546 in words is "twenty-eight million, six hundred eighty-one thousand, five hundred forty-six".