28198471 has 6 divisors (see below), whose sum is σ = 32802360. Its totient is φ = 24170076.

The previous prime is 28198453. The next prime is 28198487. The reversal of 28198471 is 17489182.

It is a happy number.

It is not a de Polignac number, because 28198471 - 2⁷ = 28198343 is a prime.

It is a super-3 number, since 3×28198471³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28198421) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 287691 + ... + 287788.

It is an arithmetic number, because the mean of its divisors is an integer number (5467060).

Almost surely, 2^28198471 is an apocalyptic number.

28198471 is a deficient number, since it is larger than the sum of its proper divisors (4603889).

28198471 is an equidigital number, since it uses as much as digits as its factorization.

28198471 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 575493 (or 575486 counting only the distinct ones).

The product of its digits is 32256, while the sum is 40.

The square root of 28198471 is about 5310.2232533105. The cubic root of 28198471 is about 304.3746786887.

The spelling of 28198471 in words is "twenty-eight million, one hundred ninety-eight thousand, four hundred seventy-one".