28304002 has 4 divisors (see below), whose sum is σ = 42456006. Its totient is φ = 14152000.

The previous prime is 28303999. The next prime is 28304021. The reversal of 28304002 is 20040382.

It is a happy number.

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., 28100601 + 203401 = 5301^2 + 451^2 .

It is a super-2 number, since 2×28304002² = 1602233058432008, which contains 22 as substring.

It is an unprimeable number.

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, 7075999 + ... + 7076002.

Almost surely, 2^28304002 is an apocalyptic number.

28304002 is a deficient number, since it is larger than the sum of its proper divisors (14152004).

28304002 is a wasteful number, since it uses less digits than its factorization.

28304002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14152003.

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 28304002 is about 5320.1505617792. The cubic root of 28304002 is about 304.7539070175.

Adding to 28304002 its reverse (20040382), we get a palindrome (48344384).

The spelling of 28304002 in words is "twenty-eight million, three hundred four thousand, two".