28133398 has 4 divisors (see below), whose sum is σ = 42200100. Its totient is φ = 14066698.

The previous prime is 28133387. The next prime is 28133423. The reversal of 28133398 is 89333182.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7033348 + ... + 7033351.

It is an arithmetic number, because the mean of its divisors is an integer number (10550025).

Almost surely, 2^28133398 is an apocalyptic number.

28133398 is a deficient number, since it is larger than the sum of its proper divisors (14066702).

28133398 is a wasteful number, since it uses less digits than its factorization.

28133398 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14066701.

The product of its digits is 31104, while the sum is 37.

The square root of 28133398 is about 5304.0925708362. The cubic root of 28133398 is about 304.1403654079.

The spelling of 28133398 in words is "twenty-eight million, one hundred thirty-three thousand, three hundred ninety-eight".