28808386 has 4 divisors (see below), whose sum is σ = 43212582. Its totient is φ = 14404192.

The previous prime is 28808383. The next prime is 28808407. The reversal of 28808386 is 68380882.

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., 21949225 + 6859161 = 4685^2 + 2619^2 .

It is not an unprimeable number, because it can be changed into a prime (28808383) 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 as a sum of consecutive naturals, namely, 7202095 + ... + 7202098.

Almost surely, 2^28808386 is an apocalyptic number.

28808386 is a deficient number, since it is larger than the sum of its proper divisors (14404196).

28808386 is a wasteful number, since it uses less digits than its factorization.

28808386 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14404195.

The product of its (nonzero) digits is 147456, while the sum is 43.

The square root of 28808386 is about 5367.3444085507. The cubic root of 28808386 is about 306.5535213244.

The spelling of 28808386 in words is "twenty-eight million, eight hundred eight thousand, three hundred eighty-six".