2170256 has 60 divisors (see below), whose sum is σ = 4947600. Its totient is φ = 918720.

The previous prime is 2170247. The next prime is 2170261. The reversal of 2170256 is 6520712.

It is a super-2 number, since 2×2170256² = 9420022211072, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 36755 + ... + 36813.

It is an arithmetic number, because the mean of its divisors is an integer number (82460).

2^2170256 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 2170256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2473800).

2170256 is an abundant number, since it is smaller than the sum of its proper divisors (2777344).

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

2170256 is a wasteful number, since it uses less digits than its factorization.

2170256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108 (or 91 counting only the distinct ones).

The product of its (nonzero) digits is 840, while the sum is 23.

The square root of 2170256 is about 1473.1788757649. The cubic root of 2170256 is about 129.4703499448.

Adding to 2170256 its reverse (6520712), we get a palindrome (8690968).

The spelling of 2170256 in words is "two million, one hundred seventy thousand, two hundred fifty-six".