28267785 has 120 divisors (see below), whose sum is σ = 63771840. Its totient is φ = 11726208.

The previous prime is 28267783. The next prime is 28267817. The reversal of 28267785 is 58776282.

It is not a de Polignac number, because 28267785 - 2¹ = 28267783 is a prime.

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

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 28267785.

It is not an unprimeable number, because it can be changed into a prime (28267781) 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 119 ways as a sum of consecutive naturals, for example, 479086 + ... + 479144.

It is an arithmetic number, because the mean of its divisors is an integer number (531432).

Almost surely, 2^28267785 is an apocalyptic number.

It is an amenable number.

28267785 is an abundant number, since it is smaller than the sum of its proper divisors (35504055).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28267785 is a wasteful number, since it uses less digits than its factorization.

28267785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109 (or 87 counting only the distinct ones).

The product of its digits is 376320, while the sum is 45.

The square root of 28267785 is about 5316.7457151908. The cubic root of 28267785 is about 304.6238667113.

The spelling of 28267785 in words is "twenty-eight million, two hundred sixty-seven thousand, seven hundred eighty-five".