28304978 has 16 divisors (see below), whose sum is σ = 45818136. Its totient is φ = 13036800.

The previous prime is 28304971. The next prime is 28304993. The reversal of 28304978 is 87940382.

It can be written as a sum of positive squares in 4 ways, for example, as 18861649 + 9443329 = 4343^2 + 3073^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28304971) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17450 + ... + 19002.

Almost surely, 2^28304978 is an apocalyptic number.

28304978 is a deficient number, since it is larger than the sum of its proper divisors (17513158).

28304978 is a wasteful number, since it uses less digits than its factorization.

28304978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2269.

The product of its (nonzero) digits is 96768, while the sum is 41.

The square root of 28304978 is about 5320.2422877159. The cubic root of 28304978 is about 304.7574098954.

The spelling of 28304978 in words is "twenty-eight million, three hundred four thousand, nine hundred seventy-eight".