28355331 has 8 divisors (see below), whose sum is σ = 38197264. Its totient is φ = 18708480.

The previous prime is 28355309. The next prime is 28355339. The reversal of 28355331 is 13355382.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28355331 - 2⁶ = 28355267 is a prime.

It is a super-2 number, since 2×28355331² = 1608049592239122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28355339) by changing a digit.

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 in 7 ways as a sum of consecutive naturals, for example, 48430 + ... + 49011.

It is an arithmetic number, because the mean of its divisors is an integer number (4774658).

Almost surely, 2^28355331 is an apocalyptic number.

28355331 is a deficient number, since it is larger than the sum of its proper divisors (9841933).

28355331 is an equidigital number, since it uses as much as digits as its factorization.

28355331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97541.

The product of its digits is 10800, while the sum is 30.

The square root of 28355331 is about 5324.9723942946. The cubic root of 28355331 is about 304.9380184003.

The spelling of 28355331 in words is "twenty-eight million, three hundred fifty-five thousand, three hundred thirty-one".