28308226 has 4 divisors (see below), whose sum is σ = 42462342. Its totient is φ = 14154112.

The previous prime is 28308223. The next prime is 28308251. The reversal of 28308226 is 62280382.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 62280382 = 2 ⋅31140191.

It can be written as a sum of positive squares in only one way, i.e., 26988025 + 1320201 = 5195^2 + 1149^2 .

It is not an unprimeable number, because it can be changed into a prime (28308223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7077055 + ... + 7077058.

Almost surely, 2^28308226 is an apocalyptic number.

28308226 is a deficient number, since it is larger than the sum of its proper divisors (14154116).

28308226 is a wasteful number, since it uses less digits than its factorization.

28308226 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14154115.

The product of its (nonzero) digits is 9216, while the sum is 31.

The square root of 28308226 is about 5320.5475282155. The cubic root of 28308226 is about 304.7690664340.

The spelling of 28308226 in words is "twenty-eight million, three hundred eight thousand, two hundred twenty-six".