28019856 has 40 divisors (see below), whose sum is σ = 72656064. Its totient is φ = 9304960.

The previous prime is 28019837. The next prime is 28019857. The reversal of 28019856 is 65891082.

It is a super-2 number, since 2×28019856² = 1570224660521472, which contains 22 as substring.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (28019857) 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 7 ways as a sum of consecutive naturals, for example, 13990 + ... + 15866.

Almost surely, 2^28019856 is an apocalyptic number.

It is an amenable number.

28019856 is an abundant number, since it is smaller than the sum of its proper divisors (44636208).

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

28019856 is a wasteful number, since it uses less digits than its factorization.

28019856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2199 (or 2193 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 39.

The square root of 28019856 is about 5293.3785052649. The cubic root of 28019856 is about 303.7306594063.

The spelling of 28019856 in words is "twenty-eight million, nineteen thousand, eight hundred fifty-six".