28078266 has 8 divisors (see below), whose sum is σ = 56156544. Its totient is φ = 9359420.

The previous prime is 28078261. The next prime is 28078273. The reversal of 28078266 is 66287082.

It is a sphenic number, since it is the product of 3 distinct primes.

28078266 is an admirable number.

It is a super-3 number, since 3×28078266³ (a number of 23 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (28078261) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 2339850 + ... + 2339861.

It is an arithmetic number, because the mean of its divisors is an integer number (7019568).

Almost surely, 2^28078266 is an apocalyptic number.

28078266 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

28078266 is a wasteful number, since it uses less digits than its factorization.

28078266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4679716.

The product of its (nonzero) digits is 64512, while the sum is 39.

The square root of 28078266 is about 5298.8929032393. The cubic root of 28078266 is about 303.9415645415.

The spelling of 28078266 in words is "twenty-eight million, seventy-eight thousand, two hundred sixty-six".