28181298 has 8 divisors (see below), whose sum is σ = 56362608. Its totient is φ = 9393764.

The previous prime is 28181287. The next prime is 28181299. The reversal of 28181298 is 89218182.

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

28181298 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (28181299) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 2348436 + ... + 2348447.

It is an arithmetic number, because the mean of its divisors is an integer number (7045326).

Almost surely, 2^28181298 is an apocalyptic number.

28181298 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28181298 is a wasteful number, since it uses less digits than its factorization.

28181298 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4696888.

The product of its digits is 18432, while the sum is 39.

The square root of 28181298 is about 5308.6060317187. The cubic root of 28181298 is about 304.3128776096.

It can be divided in two parts, 28181 and 298, that multiplied together give a palindrome (8397938).

The spelling of 28181298 in words is "twenty-eight million, one hundred eighty-one thousand, two hundred ninety-eight".