28308338 has 4 divisors (see below), whose sum is σ = 42462510. Its totient is φ = 14154168.

The previous prime is 28308311. The next prime is 28308341. The reversal of 28308338 is 83380382.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 24571849 + 3736489 = 4957^2 + 1933^2 .

It is a junction number, because it is equal to n+sod(n) for n = 28308298 and 28308307.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 7077083 + ... + 7077086.

Almost surely, 2^28308338 is an apocalyptic number.

28308338 is a deficient number, since it is larger than the sum of its proper divisors (14154172).

28308338 is a wasteful number, since it uses less digits than its factorization.

28308338 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14154171.

The product of its (nonzero) digits is 27648, while the sum is 35.

The square root of 28308338 is about 5320.5580534376. The cubic root of 28308338 is about 304.7694683677.

The spelling of 28308338 in words is "twenty-eight million, three hundred eight thousand, three hundred thirty-eight".