28681756 has 6 divisors (see below), whose sum is σ = 50193080. Its totient is φ = 14340876.

The previous prime is 28681753. The next prime is 28681781. The reversal of 28681756 is 65718682.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28681753) by changing a digit.

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, 3585216 + ... + 3585223.

Almost surely, 2^28681756 is an apocalyptic number.

It is an amenable number.

28681756 is a deficient number, since it is larger than the sum of its proper divisors (21511324).

28681756 is a wasteful number, since it uses less digits than its factorization.

28681756 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7170443 (or 7170441 counting only the distinct ones).

The product of its digits is 161280, while the sum is 43.

The square root of 28681756 is about 5355.5350806432. The cubic root of 28681756 is about 306.1036998840.

It can be divided in two parts, 2868 and 1756, that added together give a square (4624 = 68²).

The spelling of 28681756 in words is "twenty-eight million, six hundred eighty-one thousand, seven hundred fifty-six".