28404198 has 12 divisors (see below), whose sum is σ = 61542468. Its totient is φ = 9468060.

The previous prime is 28404191. The next prime is 28404203. The reversal of 28404198 is 89140482.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28404191) 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, 788988 + ... + 789023.

It is an arithmetic number, because the mean of its divisors is an integer number (5128539).

Almost surely, 2^28404198 is an apocalyptic number.

28404198 is an abundant number, since it is smaller than the sum of its proper divisors (33138270).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28404198 is a wasteful number, since it uses less digits than its factorization.

28404198 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1578019 (or 1578016 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 36.

The square root of 28404198 is about 5329.5588935671. The cubic root of 28404198 is about 305.1130925227.

The spelling of 28404198 in words is "twenty-eight million, four hundred four thousand, one hundred ninety-eight".