28818491 has 8 divisors (see below), whose sum is σ = 31562160. Its totient is φ = 26150112.

The previous prime is 28818481. The next prime is 28818511. The reversal of 28818491 is 19481882.

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 28818491 - 2¹⁴ = 28802107 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28818481) 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 7 ways as a sum of consecutive naturals, for example, 18020 + ... + 19553.

It is an arithmetic number, because the mean of its divisors is an integer number (3945270).

Almost surely, 2^28818491 is an apocalyptic number.

28818491 is a deficient number, since it is larger than the sum of its proper divisors (2743669).

28818491 is a wasteful number, since it uses less digits than its factorization.

28818491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37645.

The product of its digits is 36864, while the sum is 41.

The square root of 28818491 is about 5368.2856667655. The cubic root of 28818491 is about 306.5893599770.

The spelling of 28818491 in words is "twenty-eight million, eight hundred eighteen thousand, four hundred ninety-one".