2156568 has 32 divisors (see below), whose sum is σ = 5486400. Its totient is φ = 706208.

The previous prime is 2156537. The next prime is 2156597. The reversal of 2156568 is 8656512.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 655 + ... + 2177.

It is an arithmetic number, because the mean of its divisors is an integer number (171450).

2^2156568 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 2156568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2743200).

2156568 is an abundant number, since it is smaller than the sum of its proper divisors (3329832).

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

2156568 is a wasteful number, since it uses less digits than its factorization.

2156568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1591 (or 1587 counting only the distinct ones).

The product of its digits is 14400, while the sum is 33.

The square root of 2156568 is about 1468.5257913976. The cubic root of 2156568 is about 129.1975819629.

The spelling of 2156568 in words is "two million, one hundred fifty-six thousand, five hundred sixty-eight".