28861856 has 24 divisors (see below), whose sum is σ = 57788640. Its totient is φ = 14185408.

The previous prime is 28861853. The next prime is 28861867. The reversal of 28861856 is 65816882.

It is not an unprimeable number, because it can be changed into a prime (28861853) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5756 + ... + 9531.

It is an arithmetic number, because the mean of its divisors is an integer number (2407860).

Almost surely, 2^28861856 is an apocalyptic number.

It is an amenable number.

28861856 is an abundant number, since it is smaller than the sum of its proper divisors (28926784).

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

28861856 is a wasteful number, since it uses less digits than its factorization.

28861856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15356 (or 15348 counting only the distinct ones).

The product of its digits is 184320, while the sum is 44.

The square root of 28861856 is about 5372.3231473916. The cubic root of 28861856 is about 306.7430643519.

The spelling of 28861856 in words is "twenty-eight million, eight hundred sixty-one thousand, eight hundred fifty-six".