28419856 has 10 divisors (see below), whose sum is σ = 55063502. Its totient is φ = 14209920.

The previous prime is 28419851. The next prime is 28419871. The reversal of 28419856 is 65891482.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 28259856 + 160000 = 5316^2 + 400^2 .

It is not an unprimeable number, because it can be changed into a prime (28419851) 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 as a sum of consecutive naturals, namely, 888105 + ... + 888136.

Almost surely, 2^28419856 is an apocalyptic number.

It is an amenable number.

28419856 is a deficient number, since it is larger than the sum of its proper divisors (26643646).

28419856 is a wasteful number, since it uses less digits than its factorization.

28419856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1776249 (or 1776243 counting only the distinct ones).

The product of its digits is 138240, while the sum is 43.

The square root of 28419856 is about 5331.0276682831. The cubic root of 28419856 is about 305.1691474200.

The spelling of 28419856 in words is "twenty-eight million, four hundred nineteen thousand, eight hundred fifty-six".