2108636640 has 144 divisors (see below), whose sum is σ = 7849938096. Its totient is φ = 511180800.

The previous prime is 2108636627. The next prime is 2108636659. The reversal of 2108636640 is 466368012.

2108636640 is a `hidden beast` number, since 2 + 1 + 0 + 8 + 6 + 3 + 6 + 640 = 666.

It is a tau number, because it is divible by the number of its divisors (144).

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

It is a junction number, because it is equal to n+sod(n) for n = 2108636595 and 2108636604.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 50721 + ... + 82400.

It is an arithmetic number, because the mean of its divisors is an integer number (54513459).

Almost surely, 2^2108636640 is an apocalyptic number.

2108636640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2108636640 is an abundant number, since it is smaller than the sum of its proper divisors (5741301456).

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

2108636640 is a wasteful number, since it uses less digits than its factorization.

2108636640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133153 (or 133142 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 36.

The square root of 2108636640 is about 45919.8937281000. The cubic root of 2108636640 is about 1282.3323036893.

The spelling of 2108636640 in words is "two billion, one hundred eight million, six hundred thirty-six thousand, six hundred forty".