28881155 has 8 divisors (see below), whose sum is σ = 34870992. Its totient is φ = 22962528.

The previous prime is 28881143. The next prime is 28881161. The reversal of 28881155 is 55118882.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28881155 - 2¹² = 28877059 is a prime.

It is a super-2 number, since 2×28881155² = 1668242228268050, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16904 + ... + 18533.

It is an arithmetic number, because the mean of its divisors is an integer number (4358874).

Almost surely, 2^28881155 is an apocalyptic number.

28881155 is a deficient number, since it is larger than the sum of its proper divisors (5989837).

28881155 is a wasteful number, since it uses less digits than its factorization.

28881155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35605.

The product of its digits is 25600, while the sum is 38.

The square root of 28881155 is about 5374.1189975660. The cubic root of 28881155 is about 306.8114188774.

The spelling of 28881155 in words is "twenty-eight million, eight hundred eighty-one thousand, one hundred fifty-five".