28768655 has 4 divisors (see below), whose sum is σ = 34522392. Its totient is φ = 23014920.

The previous prime is 28768639. The next prime is 28768657. The reversal of 28768655 is 55686782.

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

It is not a de Polignac number, because 28768655 - 2⁴ = 28768639 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28768657) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2876861 + ... + 2876870.

It is an arithmetic number, because the mean of its divisors is an integer number (8630598).

Almost surely, 2^28768655 is an apocalyptic number.

28768655 is a deficient number, since it is larger than the sum of its proper divisors (5753737).

28768655 is an equidigital number, since it uses as much as digits as its factorization.

28768655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5753736.

The product of its digits is 806400, while the sum is 47.

The square root of 28768655 is about 5363.6419530017. The cubic root of 28768655 is about 306.4125290286.

The spelling of 28768655 in words is "twenty-eight million, seven hundred sixty-eight thousand, six hundred fifty-five".