28494155 has 4 divisors (see below), whose sum is σ = 34192992. Its totient is φ = 22795320.

The previous prime is 28494143. The next prime is 28494161. The reversal of 28494155 is 55149482.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 55149482 = 2 ⋅27574741.

It is not a de Polignac number, because 28494155 - 2¹⁰ = 28493131 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 2849411 + ... + 2849420.

It is an arithmetic number, because the mean of its divisors is an integer number (8548248).

Almost surely, 2^28494155 is an apocalyptic number.

28494155 is a deficient number, since it is larger than the sum of its proper divisors (5698837).

28494155 is an equidigital number, since it uses as much as digits as its factorization.

28494155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5698836.

The product of its digits is 57600, while the sum is 38.

The square root of 28494155 is about 5337.9916635379. The cubic root of 28494155 is about 305.4348540466.

The spelling of 28494155 in words is "twenty-eight million, four hundred ninety-four thousand, one hundred fifty-five".