28391198 has 12 divisors (see below), whose sum is σ = 46810680. Its totient is φ = 12904980.

The previous prime is 28391197. The next prime is 28391227. The reversal of 28391198 is 89119382.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28391197) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 58418 + ... + 58901.

It is an arithmetic number, because the mean of its divisors is an integer number (3900890).

Almost surely, 2^28391198 is an apocalyptic number.

28391198 is a deficient number, since it is larger than the sum of its proper divisors (18419482).

28391198 is a wasteful number, since it uses less digits than its factorization.

28391198 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117343 (or 117332 counting only the distinct ones).

The product of its digits is 31104, while the sum is 41.

The square root of 28391198 is about 5328.3391408581. The cubic root of 28391198 is about 305.0665374856.

The spelling of 28391198 in words is "twenty-eight million, three hundred ninety-one thousand, one hundred ninety-eight".