28223198 has 4 divisors (see below), whose sum is σ = 42334800. Its totient is φ = 14111598.

The previous prime is 28223197. The next prime is 28223201. The reversal of 28223198 is 89132282.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 89132282 = 2 ⋅44566141.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28223191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7055798 + ... + 7055801.

It is an arithmetic number, because the mean of its divisors is an integer number (10583700).

Almost surely, 2^28223198 is an apocalyptic number.

28223198 is a deficient number, since it is larger than the sum of its proper divisors (14111602).

28223198 is a wasteful number, since it uses less digits than its factorization.

28223198 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14111601.

The product of its digits is 13824, while the sum is 35.

The square root of 28223198 is about 5312.5509879906. The cubic root of 28223198 is about 304.4636205542.

The spelling of 28223198 in words is "twenty-eight million, two hundred twenty-three thousand, one hundred ninety-eight".