28331306 has 4 divisors (see below), whose sum is σ = 42496962. Its totient is φ = 14165652.

The previous prime is 28331291. The next prime is 28331321. The reversal of 28331306 is 60313382.

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 (28331291) and next prime (28331321).

It can be written as a sum of positive squares in only one way, i.e., 26988025 + 1343281 = 5195^2 + 1159^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7082825 + ... + 7082828.

Almost surely, 2^28331306 is an apocalyptic number.

28331306 is a deficient number, since it is larger than the sum of its proper divisors (14165656).

28331306 is a wasteful number, since it uses less digits than its factorization.

28331306 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14165655.

The product of its (nonzero) digits is 2592, while the sum is 26.

The square root of 28331306 is about 5322.7160360102. The cubic root of 28331306 is about 304.8518710962.

Adding to 28331306 its reverse (60313382), we get a palindrome (88644688).

The spelling of 28331306 in words is "twenty-eight million, three hundred thirty-one thousand, three hundred six".