28278568 has 8 divisors (see below), whose sum is σ = 53022330. Its totient is φ = 14139280.

The previous prime is 28278559. The next prime is 28278571. The reversal of 28278568 is 86587282.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 28068804 + 209764 = 5298^2 + 458^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1767403 + ... + 1767418.

Almost surely, 2^28278568 is an apocalyptic number.

It is an amenable number.

28278568 is a deficient number, since it is larger than the sum of its proper divisors (24743762).

28278568 is a wasteful number, since it uses less digits than its factorization.

28278568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3534827 (or 3534823 counting only the distinct ones).

The product of its digits is 430080, while the sum is 46.

The square root of 28278568 is about 5317.7596786617. The cubic root of 28278568 is about 304.6625956221.

The spelling of 28278568 in words is "twenty-eight million, two hundred seventy-eight thousand, five hundred sixty-eight".