28303331 has 32 divisors (see below), whose sum is σ = 35904000. Its totient is φ = 22226400.

The previous prime is 28303313. The next prime is 28303337. The reversal of 28303331 is 13330382.

It is not a de Polignac number, because 28303331 - 2²² = 24109027 is a prime.

It is a super-2 number, since 2×28303331² = 1602157091391122, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28303297 and 28303306.

It is not an unprimeable number, because it can be changed into a prime (28303337) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 280181 + ... + 280281.

It is an arithmetic number, because the mean of its divisors is an integer number (1122000).

Almost surely, 2^28303331 is an apocalyptic number.

28303331 is a deficient number, since it is larger than the sum of its proper divisors (7600669).

28303331 is a wasteful number, since it uses less digits than its factorization.

28303331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 184 (or 170 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 23.

The square root of 28303331 is about 5320.0874992804. The cubic root of 28303331 is about 304.7514987421.

The spelling of 28303331 in words is "twenty-eight million, three hundred three thousand, three hundred thirty-one".