28718133 has 4 divisors (see below), whose sum is σ = 38290848. Its totient is φ = 19145420.

The previous prime is 28718119. The next prime is 28718147. The reversal of 28718133 is 33181782.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (28718119) and next prime (28718147).

It is a cyclic number.

It is not a de Polignac number, because 28718133 - 2⁸ = 28717877 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28718094 and 28718103.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28718153) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4786353 + ... + 4786358.

It is an arithmetic number, because the mean of its divisors is an integer number (9572712).

Almost surely, 2^28718133 is an apocalyptic number.

It is an amenable number.

28718133 is a deficient number, since it is larger than the sum of its proper divisors (9572715).

28718133 is an equidigital number, since it uses as much as digits as its factorization.

28718133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9572714.

The product of its digits is 8064, while the sum is 33.

The square root of 28718133 is about 5358.9302104058. The cubic root of 28718133 is about 306.2330554001.

The spelling of 28718133 in words is "twenty-eight million, seven hundred eighteen thousand, one hundred thirty-three".