28242555 has 16 divisors (see below), whose sum is σ = 49296384. Its totient is φ = 13693280.

The previous prime is 28242553. The next prime is 28242601. The reversal of 28242555 is 55524282.

It is a happy number.

It is not a de Polignac number, because 28242555 - 2¹ = 28242553 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (28242553) 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 15 ways as a sum of consecutive naturals, for example, 85419 + ... + 85748.

It is an arithmetic number, because the mean of its divisors is an integer number (3081024).

Almost surely, 2^28242555 is an apocalyptic number.

28242555 is a deficient number, since it is larger than the sum of its proper divisors (21053829).

28242555 is a wasteful number, since it uses less digits than its factorization.

28242555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171186.

The product of its digits is 32000, while the sum is 33.

The square root of 28242555 is about 5314.3724935311. The cubic root of 28242555 is about 304.5332105354.

The spelling of 28242555 in words is "twenty-eight million, two hundred forty-two thousand, five hundred fifty-five".