2111896878 has 128 divisors (see below), whose sum is σ = 5394428928. Its totient is φ = 536315904.

The previous prime is 2111896867. The next prime is 2111896879. The reversal of 2111896878 is 8786981112.

It is a happy number.

It is a super-2 number, since 2×2111896878² = 8920216846612293768, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 2111896878.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2111896879) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2161126 + ... + 2162102.

It is an arithmetic number, because the mean of its divisors is an integer number (42143976).

Almost surely, 2^2111896878 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2111896878, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2697214464).

2111896878 is an abundant number, since it is smaller than the sum of its proper divisors (3282532050).

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

2111896878 is a wasteful number, since it uses less digits than its factorization.

2111896878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1146.

The product of its digits is 387072, while the sum is 51.

The square root of 2111896878 is about 45955.3792063562. The cubic root of 2111896878 is about 1282.9928498810.

The spelling of 2111896878 in words is "two billion, one hundred eleven million, eight hundred ninety-six thousand, eight hundred seventy-eight".