28198429 has 4 divisors (see below), whose sum is σ = 32226784. Its totient is φ = 24170076.

The previous prime is 28198421. The next prime is 28198453. The reversal of 28198429 is 92489182.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 28198429 - 2³ = 28198421 is a prime.

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 3 ways as a sum of consecutive naturals, for example, 2014167 + ... + 2014180.

It is an arithmetic number, because the mean of its divisors is an integer number (8056696).

Almost surely, 2^28198429 is an apocalyptic number.

It is an amenable number.

28198429 is a deficient number, since it is larger than the sum of its proper divisors (4028355).

28198429 is an equidigital number, since it uses as much as digits as its factorization.

28198429 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4028354.

The product of its digits is 82944, while the sum is 43.

The square root of 28198429 is about 5310.2192986731. The cubic root of 28198429 is about 304.3745275724.

The spelling of 28198429 in words is "twenty-eight million, one hundred ninety-eight thousand, four hundred twenty-nine".