28775655 has 40 divisors (see below), whose sum is σ = 51975792. Its totient is φ = 15230592.

The previous prime is 28775653. The next prime is 28775687. The reversal of 28775655 is 55657782.

28775655 is a `hidden beast` number, since 2 + 87 + 7 + 565 + 5 = 666.

It is not a de Polignac number, because 28775655 - 2¹ = 28775653 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 28775655.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28775653) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 91779 + ... + 92091.

Almost surely, 2^28775655 is an apocalyptic number.

28775655 is a deficient number, since it is larger than the sum of its proper divisors (23200137).

28775655 is a wasteful number, since it uses less digits than its factorization.

28775655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 557 (or 548 counting only the distinct ones).

The product of its digits is 588000, while the sum is 45.

The square root of 28775655 is about 5364.2944550052. The cubic root of 28775655 is about 306.4373791506.

The spelling of 28775655 in words is "twenty-eight million, seven hundred seventy-five thousand, six hundred fifty-five".