28812386 has 4 divisors (see below), whose sum is σ = 43218582. Its totient is φ = 14406192.

The previous prime is 28812383. The next prime is 28812403. The reversal of 28812386 is 68321882.

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., 26204161 + 2608225 = 5119^2 + 1615^2 .

It is not an unprimeable number, because it can be changed into a prime (28812383) 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, 7203095 + ... + 7203098.

Almost surely, 2^28812386 is an apocalyptic number.

28812386 is a deficient number, since it is larger than the sum of its proper divisors (14406196).

28812386 is a wasteful number, since it uses less digits than its factorization.

28812386 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14406195.

The product of its digits is 36864, while the sum is 38.

The square root of 28812386 is about 5367.7170193668. The cubic root of 28812386 is about 306.5677088291.

The spelling of 28812386 in words is "twenty-eight million, eight hundred twelve thousand, three hundred eighty-six".