2105800780 has 48 divisors (see below), whose sum is σ = 4815468000. Its totient is φ = 770466816.

The previous prime is 2105800777. The next prime is 2105800783. The reversal of 2105800780 is 870085012.

It is an interprime number because it is at equal distance from previous prime (2105800777) and next prime (2105800783).

It is not an unprimeable number, because it can be changed into a prime (2105800783) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 84525 + ... + 106564.

It is an arithmetic number, because the mean of its divisors is an integer number (100322250).

Almost surely, 2^2105800780 is an apocalyptic number.

2105800780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2105800780 is an abundant number, since it is smaller than the sum of its proper divisors (2709667220).

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

2105800780 is a wasteful number, since it uses less digits than its factorization.

2105800780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 191146 (or 191144 counting only the distinct ones).

The product of its (nonzero) digits is 4480, while the sum is 31.

The square root of 2105800780 is about 45889.0050011983. The cubic root of 2105800780 is about 1281.7571854256.

Adding to 2105800780 its reverse (870085012), we get a palindrome (2975885792).

The spelling of 2105800780 in words is "two billion, one hundred five million, eight hundred thousand, seven hundred eighty".