28304066 has 12 divisors (see below), whose sum is σ = 49387878. Its totient is φ = 12130272.

The previous prime is 28304057. The next prime is 28304077. The reversal of 28304066 is 66040382.

It can be written as a sum of positive squares in only one way, i.e., 16200625 + 12103441 = 4025^2 + 3479^2 .

It is a super-2 number, since 2×28304066² = 1602240304264712, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 144311 + ... + 144506.

Almost surely, 2^28304066 is an apocalyptic number.

28304066 is a deficient number, since it is larger than the sum of its proper divisors (21083812).

28304066 is a wasteful number, since it uses less digits than its factorization.

28304066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 288833 (or 288826 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 29.

The square root of 28304066 is about 5320.1565766432. The cubic root of 28304066 is about 304.7541367168.

The spelling of 28304066 in words is "twenty-eight million, three hundred four thousand, sixty-six".