2102805378 has 24 divisors (see below), whose sum is σ = 4824083628. Its totient is φ = 659703552.

The previous prime is 2102805347. The next prime is 2102805379. The reversal of 2102805378 is 8735082012.

2102805378 is a `hidden beast` number, since 2 + 1 + 0 + 280 + 5 + 378 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 2098281249 + 4524129 = 45807^2 + 2127^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2102805379) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3435651 + ... + 3436262.

Almost surely, 2^2102805378 is an apocalyptic number.

2102805378 is an abundant number, since it is smaller than the sum of its proper divisors (2721278250).

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

2102805378 is a wasteful number, since it uses less digits than its factorization.

2102805378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6871938 (or 6871935 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 36.

The square root of 2102805378 is about 45856.3559171463. The cubic root of 2102805378 is about 1281.1491507122.

The spelling of 2102805378 in words is "two billion, one hundred two million, eight hundred five thousand, three hundred seventy-eight".