28678756 has 6 divisors (see below), whose sum is σ = 50187830. Its totient is φ = 14339376.

The previous prime is 28678739. The next prime is 28678757. The reversal of 28678756 is 65787682.

It can be written as a sum of positive squares in only one way, i.e., 20070400 + 8608356 = 4480^2 + 2934^2 .

It is not an unprimeable number, because it can be changed into a prime (28678757) 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, 3584841 + ... + 3584848.

Almost surely, 2^28678756 is an apocalyptic number.

It is an amenable number.

28678756 is a deficient number, since it is larger than the sum of its proper divisors (21509074).

28678756 is a wasteful number, since it uses less digits than its factorization.

28678756 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7169693 (or 7169691 counting only the distinct ones).

The product of its digits is 1128960, while the sum is 49.

The square root of 28678756 is about 5355.2549892605. The cubic root of 28678756 is about 306.0930270935.

The spelling of 28678756 in words is "twenty-eight million, six hundred seventy-eight thousand, seven hundred fifty-six".