28132306 has 4 divisors (see below), whose sum is σ = 42198462. Its totient is φ = 14066152.

The previous prime is 28132303. The next prime is 28132309. The reversal of 28132306 is 60323182.

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

It is an interprime number because it is at equal distance from previous prime (28132303) and next prime (28132309).

It can be written as a sum of positive squares in only one way, i.e., 27468081 + 664225 = 5241^2 + 815^2 .

It is not an unprimeable number, because it can be changed into a prime (28132301) 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, 7033075 + ... + 7033078.

Almost surely, 2^28132306 is an apocalyptic number.

28132306 is a deficient number, since it is larger than the sum of its proper divisors (14066156).

28132306 is a wasteful number, since it uses less digits than its factorization.

28132306 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14066155.

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 28132306 is about 5303.9896304574. The cubic root of 28132306 is about 304.1364302798.

Adding to 28132306 its reverse (60323182), we get a palindrome (88455488).

The spelling of 28132306 in words is "twenty-eight million, one hundred thirty-two thousand, three hundred six".