28782855 has 48 divisors (see below), whose sum is σ = 52284960. Its totient is φ = 14632704.

The previous prime is 28782841. The next prime is 28782857. The reversal of 28782855 is 55828782.

It is not a de Polignac number, because 28782855 - 2⁴ = 28782839 is a prime.

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

Its product of digits (358400) is a multiple of the sum of its prime factors (400).

It is a self number, because there is not a number n which added to its sum of digits gives 28782855.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28782857) 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 47 ways as a sum of consecutive naturals, for example, 98089 + ... + 98381.

It is an arithmetic number, because the mean of its divisors is an integer number (1089270).

Almost surely, 2^28782855 is an apocalyptic number.

28782855 is a deficient number, since it is larger than the sum of its proper divisors (23502105).

28782855 is a wasteful number, since it uses less digits than its factorization.

28782855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 400 (or 397 counting only the distinct ones).

The product of its digits is 358400, while the sum is 45.

The square root of 28782855 is about 5364.9655171306. The cubic root of 28782855 is about 306.4629350721.

The spelling of 28782855 in words is "twenty-eight million, seven hundred eighty-two thousand, eight hundred fifty-five".