28777768 has 16 divisors (see below), whose sum is σ = 54698580. Its totient is φ = 14191488.

The previous prime is 28777739. The next prime is 28777769. The reversal of 28777768 is 86777782.

It can be written as a sum of positive squares in 2 ways, for example, as 28068804 + 708964 = 5298^2 + 842^2 .

It is not an unprimeable number, because it can be changed into a prime (28777769) 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 in 3 ways as a sum of consecutive naturals, for example, 24055 + ... + 25222.

Almost surely, 2^28777768 is an apocalyptic number.

It is an amenable number.

28777768 is a deficient number, since it is larger than the sum of its proper divisors (25920812).

28777768 is a wasteful number, since it uses less digits than its factorization.

28777768 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49356 (or 49352 counting only the distinct ones).

The product of its digits is 1843968, while the sum is 52.

The square root of 28777768 is about 5364.4914018013. The cubic root of 28777768 is about 306.4448795456. Note that the first 3 decimals are identical.

The spelling of 28777768 in words is "twenty-eight million, seven hundred seventy-seven thousand, seven hundred sixty-eight".