2100784878 has 24 divisors (see below), whose sum is σ = 4552791048. Its totient is φ = 700093872.

The previous prime is 2100784867. The next prime is 2100784883. The reversal of 2100784878 is 8784870012.

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, 80500 + ... + 103352.

It is an arithmetic number, because the mean of its divisors is an integer number (189699627).

Almost surely, 2^2100784878 is an apocalyptic number.

2100784878 is an abundant number, since it is smaller than the sum of its proper divisors (2452006170).

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

2100784878 is a wasteful number, since it uses less digits than its factorization.

2100784878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27968 (or 27965 counting only the distinct ones).

The product of its (nonzero) digits is 200704, while the sum is 45.

The square root of 2100784878 is about 45834.3198705948. The cubic root of 2100784878 is about 1280.7386845464.

The spelling of 2100784878 in words is "two billion, one hundred million, seven hundred eighty-four thousand, eight hundred seventy-eight".