28773855 has 24 divisors (see below), whose sum is σ = 54409680. Its totient is φ = 13950720.

The previous prime is 28773853. The next prime is 28773863. The reversal of 28773855 is 55837782.

It is not a de Polignac number, because 28773855 - 2¹ = 28773853 is a prime.

It is a super-2 number, since 2×28773855² = 1655869463122050, which contains 22 as substring.

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

It is a nialpdrome in base 12.

It is a self number, because there is not a number n which added to its sum of digits gives 28773855.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28773853) 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 23 ways as a sum of consecutive naturals, for example, 28570 + ... + 29559.

It is an arithmetic number, because the mean of its divisors is an integer number (2267070).

Almost surely, 2^28773855 is an apocalyptic number.

28773855 is a deficient number, since it is larger than the sum of its proper divisors (25635825).

28773855 is a wasteful number, since it uses less digits than its factorization.

28773855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58151 (or 58148 counting only the distinct ones).

The product of its digits is 470400, while the sum is 45.

The square root of 28773855 is about 5364.1266763566. The cubic root of 28773855 is about 306.4309895042.

The spelling of 28773855 in words is "twenty-eight million, seven hundred seventy-three thousand, eight hundred fifty-five".