28783865277 has 6 divisors (see below), whose sum is σ = 41576694302. Its totient is φ = 19189243512.

The previous prime is 28783865249. The next prime is 28783865287. The reversal of 28783865277 is 77256838782.

28783865277 is a `hidden beast` number, since 2 + 8 + 78 + 38 + 6 + 527 + 7 = 666.

It can be written as a sum of positive squares in only one way, i.e., 28752628356 + 31236921 = 169566^2 + 5589^2 .

It is not a de Polignac number, because 28783865277 - 2¹⁸ = 28783603133 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 (28783865287) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1599103618 + ... + 1599103635.

Almost surely, 2^28783865277 is an apocalyptic number.

It is an amenable number.

28783865277 is a deficient number, since it is larger than the sum of its proper divisors (12792829025).

28783865277 is a wasteful number, since it uses less digits than its factorization.

28783865277 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3198207259 (or 3198207256 counting only the distinct ones).

The product of its digits is 63221760, while the sum is 63.

The spelling of 28783865277 in words is "twenty-eight billion, seven hundred eighty-three million, eight hundred sixty-five thousand, two hundred seventy-seven".