28198419 has 4 divisors (see below), whose sum is σ = 37597896. Its totient is φ = 18798944.

The previous prime is 28198381. The next prime is 28198421. The reversal of 28198419 is 91489182.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28198419 - 2¹² = 28194323 is a prime.

It is a super-2 number, since 2×28198419² = 1590301668199122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28190419) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4699734 + ... + 4699739.

It is an arithmetic number, because the mean of its divisors is an integer number (9399474).

Almost surely, 2^28198419 is an apocalyptic number.

28198419 is a deficient number, since it is larger than the sum of its proper divisors (9399477).

28198419 is an equidigital number, since it uses as much as digits as its factorization.

28198419 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9399476.

The product of its digits is 41472, while the sum is 42.

The square root of 28198419 is about 5310.2183570923. The cubic root of 28198419 is about 304.3744915923.

The spelling of 28198419 in words is "twenty-eight million, one hundred ninety-eight thousand, four hundred nineteen".