28303011 has 48 divisors (see below), whose sum is σ = 48117888. Its totient is φ = 15840000.

The previous prime is 28303003. The next prime is 28303013. The reversal of 28303011 is 11030382.

It is not a de Polignac number, because 28303011 - 2³ = 28303003 is a prime.

It is a super-2 number, since 2×28303011² = 1602120863332242, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28303013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 112636 + ... + 112886.

It is an arithmetic number, because the mean of its divisors is an integer number (1002456).

Almost surely, 2^28303011 is an apocalyptic number.

28303011 is a deficient number, since it is larger than the sum of its proper divisors (19814877).

28303011 is a wasteful number, since it uses less digits than its factorization.

28303011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 352 (or 349 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 28303011 is about 5320.0574245021. The cubic root of 28303011 is about 304.7503502219.

Adding to 28303011 its reverse (11030382), we get a palindrome (39333393).

The spelling of 28303011 in words is "twenty-eight million, three hundred three thousand, eleven".