28268656 has 80 divisors (see below), whose sum is σ = 64995840. Its totient is φ = 11784960.

The previous prime is 28268623. The next prime is 28268677. The reversal of 28268656 is 65686282.

It is a super-3 number, since 3×28268656³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 90741 + ... + 91051.

It is an arithmetic number, because the mean of its divisors is an integer number (812448).

Almost surely, 2^28268656 is an apocalyptic number.

28268656 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28268656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32497920).

28268656 is an abundant number, since it is smaller than the sum of its proper divisors (36727184).

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

28268656 is a wasteful number, since it uses less digits than its factorization.

28268656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 374 (or 368 counting only the distinct ones).

The product of its digits is 276480, while the sum is 43.

The square root of 28268656 is about 5316.8276255677. The cubic root of 28268656 is about 304.6269954160.

The spelling of 28268656 in words is "twenty-eight million, two hundred sixty-eight thousand, six hundred fifty-six".