28838155 has 4 divisors (see below), whose sum is σ = 34605792. Its totient is φ = 23070520.

The previous prime is 28838099. The next prime is 28838167. The reversal of 28838155 is 55183882.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 28838155 - 2⁷ = 28838027 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2883811 + ... + 2883820.

It is an arithmetic number, because the mean of its divisors is an integer number (8651448).

Almost surely, 2^28838155 is an apocalyptic number.

28838155 is a deficient number, since it is larger than the sum of its proper divisors (5767637).

28838155 is an equidigital number, since it uses as much as digits as its factorization.

28838155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5767636.

The product of its digits is 76800, while the sum is 40.

The square root of 28838155 is about 5370.1168516151. The cubic root of 28838155 is about 306.6590768180.

The spelling of 28838155 in words is "twenty-eight million, eight hundred thirty-eight thousand, one hundred fifty-five".