3128868 has 84 divisors (see below), whose sum is σ = 8722140. Its totient is φ = 979776.

The previous prime is 3128849. The next prime is 3128869. The reversal of 3128868 is 8688213.

It can be written as a sum of positive squares in 2 ways, for example, as 2286144 + 842724 = 1512^2 + 918^2 .

It is a super-2 number, since 2×3128868² = 19579629922848, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3128869) 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 27 ways as a sum of consecutive naturals, for example, 84546 + ... + 84582.

It is an arithmetic number, because the mean of its divisors is an integer number (103835).

Almost surely, 2^3128868 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3128868, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4361070).

3128868 is an abundant number, since it is smaller than the sum of its proper divisors (5593272).

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

3128868 is a wasteful number, since it uses less digits than its factorization.

3128868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88 (or 71 counting only the distinct ones).

The product of its digits is 18432, while the sum is 36.

The square root of 3128868 is about 1768.8606502492. The cubic root of 3128868 is about 146.2611825769.

It can be divided in two parts, 312 and 8868, that added together give a triangular number (9180 = T₁₃₅).

The spelling of 3128868 in words is "three million, one hundred twenty-eight thousand, eight hundred sixty-eight".