2128656 has 40 divisors (see below), whose sum is σ = 5596864. Its totient is φ = 696960.

The previous prime is 2128649. The next prime is 2128663. The reversal of 2128656 is 6568212.

It is an interprime number because it is at equal distance from previous prime (2128649) and next prime (2128663).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2565 + ... + 3291.

2^2128656 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 2128656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2798432).

2128656 is an abundant number, since it is smaller than the sum of its proper divisors (3468208).

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

2128656 is a wasteful number, since it uses less digits than its factorization.

2128656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 799 (or 793 counting only the distinct ones).

The product of its digits is 5760, while the sum is 30.

The square root of 2128656 is about 1458.9914324629. The cubic root of 2128656 is about 128.6377675289.

The spelling of 2128656 in words is "two million, one hundred twenty-eight thousand, six hundred fifty-six".