2011913856 has 128 divisors (see below), whose sum is σ = 6013920000. Its totient is φ = 662059008.

The previous prime is 2011913837. The next prime is 2011913861. The reversal of 2011913856 is 6583191102.

It is a tau number, because it is divible by the number of its divisors (128).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 2011913856.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 269340 + ... + 276708.

It is an arithmetic number, because the mean of its divisors is an integer number (46983750).

Almost surely, 2^2011913856 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 2011913856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3006960000).

2011913856 is an abundant number, since it is smaller than the sum of its proper divisors (4002006144).

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

2011913856 is an equidigital number, since it uses as much as digits as its factorization.

2011913856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7471 (or 7453 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 36.

The square root of 2011913856 is about 44854.3627309541. The cubic root of 2011913856 is about 1262.4178516754.

The spelling of 2011913856 in words is "two billion, eleven million, nine hundred thirteen thousand, eight hundred fifty-six".