2108206638 has 24 divisors (see below), whose sum is σ = 4568630976. Its totient is φ = 702604800.

The previous prime is 2108206613. The next prime is 2108206663. The reversal of 2108206638 is 8366028012.

2108206638 is a `hidden beast` number, since 2 + 10 + 8 + 2 + 0 + 6 + 638 = 666.

It is an interprime number because it is at equal distance from previous prime (2108206613) and next prime (2108206663).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 167278 + ... + 179438.

It is an arithmetic number, because the mean of its divisors is an integer number (190359624).

Almost surely, 2^2108206638 is an apocalyptic number.

2108206638 is an abundant number, since it is smaller than the sum of its proper divisors (2460424338).

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

2108206638 is a wasteful number, since it uses less digits than its factorization.

2108206638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21800 (or 21797 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 36.

The square root of 2108206638 is about 45915.2114010161. The cubic root of 2108206638 is about 1282.2451315752.

The spelling of 2108206638 in words is "two billion, one hundred eight million, two hundred six thousand, six hundred thirty-eight".