2157568 has 66 divisors (see below), whose sum is σ = 5133876. Its totient is φ = 903168.

The previous prime is 2157563. The next prime is 2157587. The reversal of 2157568 is 8657512.

It is not an unprimeable number, because it can be changed into a prime (2157563) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 50155 + ... + 50197.

It is an arithmetic number, because the mean of its divisors is an integer number (77786).

2^2157568 is an apocalyptic number.

2157568 is a gapful number since it is divisible by the number (28) 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 2157568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2566938).

2157568 is an abundant number, since it is smaller than the sum of its proper divisors (2976308).

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

2157568 is an equidigital number, since it uses as much as digits as its factorization.

2157568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77 (or 52 counting only the distinct ones).

The product of its digits is 16800, while the sum is 34.

The square root of 2157568 is about 1468.8662294436. The cubic root of 2157568 is about 129.2175485051.

The spelling of 2157568 in words is "two million, one hundred fifty-seven thousand, five hundred sixty-eight".