2186781696 has 396 divisors, whose sum is σ = 7262567676. Its totient is φ = 632586240.

The previous prime is 2186781683. The next prime is 2186781719. The reversal of 2186781696 is 6961876812.

It can be written as a sum of positive squares in 2 ways, for example, as 1784217600 + 402564096 = 42240^2 + 20064^2 .

It is a tau number, because it is divible by the number of its divisors (396).

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 41260006 + ... + 41260058.

Almost surely, 2^2186781696 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 2186781696, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3631283838).

2186781696 is an abundant number, since it is smaller than the sum of its proper divisors (5075785980).

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

2186781696 is a wasteful number, since it uses less digits than its factorization.

2186781696 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138 (or 106 counting only the distinct ones).

The product of its digits is 1741824, while the sum is 54.

The square root of 2186781696 is about 46763.0377114233. The cubic root of 2186781696 is about 1297.9814226969.

The spelling of 2186781696 in words is "two billion, one hundred eighty-six million, seven hundred eighty-one thousand, six hundred ninety-six".