28302978 has 16 divisors (see below), whose sum is σ = 61752096. Its totient is φ = 8576640.

The previous prime is 28302971. The next prime is 28302983. The reversal of 28302978 is 87920382.

It is not an unprimeable number, because it can be changed into a prime (28302971) 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, 214351 + ... + 214482.

It is an arithmetic number, because the mean of its divisors is an integer number (3859506).

Almost surely, 2^28302978 is an apocalyptic number.

28302978 is an abundant number, since it is smaller than the sum of its proper divisors (33449118).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28302978 is a wasteful number, since it uses less digits than its factorization.

28302978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 428849.

The product of its (nonzero) digits is 48384, while the sum is 39.

The square root of 28302978 is about 5320.0543230309. The cubic root of 28302978 is about 304.7502317802.

The spelling of 28302978 in words is "twenty-eight million, three hundred two thousand, nine hundred seventy-eight".