28391336 has 32 divisors (see below), whose sum is σ = 54432000. Its totient is φ = 13880256.

The previous prime is 28391333. The next prime is 28391357. The reversal of 28391336 is 63319382.

It is a junction number, because it is equal to n+sod(n) for n = 28391296 and 28391305.

It is not an unprimeable number, because it can be changed into a prime (28391333) 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 7 ways as a sum of consecutive naturals, for example, 105410 + ... + 105678.

It is an arithmetic number, because the mean of its divisors is an integer number (1701000).

Almost surely, 2^28391336 is an apocalyptic number.

It is an amenable number.

28391336 is a deficient number, since it is larger than the sum of its proper divisors (26040664).

28391336 is a wasteful number, since it uses less digits than its factorization.

28391336 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 521 (or 517 counting only the distinct ones).

The product of its digits is 23328, while the sum is 35.

The square root of 28391336 is about 5328.3520904685. The cubic root of 28391336 is about 305.0670317598.

It can be divided in two parts, 283 and 91336, that added together give a palindrome (91619).

The spelling of 28391336 in words is "twenty-eight million, three hundred ninety-one thousand, three hundred thirty-six".