28278556 has 12 divisors (see below), whose sum is σ = 50226568. Its totient is φ = 13928112.

The previous prime is 28278533. The next prime is 28278559. The reversal of 28278556 is 65587282.

It is a super-3 number, since 3×28278556³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28278559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52491 + ... + 53026.

Almost surely, 2^28278556 is an apocalyptic number.

It is an amenable number.

28278556 is a deficient number, since it is larger than the sum of its proper divisors (21948012).

28278556 is a wasteful number, since it uses less digits than its factorization.

28278556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105588 (or 105586 counting only the distinct ones).

The product of its digits is 268800, while the sum is 43.

The square root of 28278556 is about 5317.7585503669. The cubic root of 28278556 is about 304.6625525276.

The spelling of 28278556 in words is "twenty-eight million, two hundred seventy-eight thousand, five hundred fifty-six".