28438336 has 14 divisors (see below), whose sum is σ = 56432450. Its totient is φ = 14219136.

The previous prime is 28438321. The next prime is 28438343. The reversal of 28438336 is 63383482.

It can be written as a sum of positive squares in only one way, i.e., 21678336 + 6760000 = 4656^2 + 2600^2 .

It is a junction number, because it is equal to n+sod(n) for n = 28438295 and 28438304.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 222111 + ... + 222238.

Almost surely, 2^28438336 is an apocalyptic number.

It is an amenable number.

28438336 is a deficient number, since it is larger than the sum of its proper divisors (27994114).

28438336 is an equidigital number, since it uses as much as digits as its factorization.

28438336 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 444361 (or 444351 counting only the distinct ones).

The product of its digits is 82944, while the sum is 37.

The square root of 28438336 is about 5332.7606359183. The cubic root of 28438336 is about 305.2352784602.

The spelling of 28438336 in words is "twenty-eight million, four hundred thirty-eight thousand, three hundred thirty-six".