28842885 has 56 divisors (see below), whose sum is σ = 53434584. Its totient is φ = 14929920.

The previous prime is 28842881. The next prime is 28842887. The reversal of 28842885 is 58824882.

It can be written as a sum of positive squares in 4 ways, for example, as 263169 + 28579716 = 513^2 + 5346^2 .

It is not a de Polignac number, because 28842885 - 2² = 28842881 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 28842885.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28842881) by changing a digit.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 149349 + ... + 149541.

It is an arithmetic number, because the mean of its divisors is an integer number (954189).

Almost surely, 2^28842885 is an apocalyptic number.

It is an amenable number.

28842885 is a deficient number, since it is larger than the sum of its proper divisors (24591699).

28842885 is an equidigital number, since it uses as much as digits as its factorization.

28842885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 257 (or 242 counting only the distinct ones).

The product of its digits is 327680, while the sum is 45.

The square root of 28842885 is about 5370.5572336583. The cubic root of 28842885 is about 306.6758418542.

The spelling of 28842885 in words is "twenty-eight million, eight hundred forty-two thousand, eight hundred eighty-five".