28056518 has 24 divisors (see below), whose sum is σ = 49698072. Its totient is φ = 11841984.

The previous prime is 28056517. The next prime is 28056541. The reversal of 28056518 is 81565082.

It is a happy number.

It is a super-3 number, since 3×28056518³ (a number of 23 digits) contains 333 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28056517) 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 11 ways as a sum of consecutive naturals, for example, 4430 + ... + 8702.

It is an arithmetic number, because the mean of its divisors is an integer number (2070753).

Almost surely, 2^28056518 is an apocalyptic number.

28056518 is a deficient number, since it is larger than the sum of its proper divisors (21641554).

28056518 is a wasteful number, since it uses less digits than its factorization.

28056518 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4356 (or 4349 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 35.

The square root of 28056518 is about 5296.8403789429. The cubic root of 28056518 is about 303.8630717017.

The spelling of 28056518 in words is "twenty-eight million, fifty-six thousand, five hundred eighteen".