2855906780 has 48 divisors (see below), whose sum is σ = 6278598144. Its totient is φ = 1089126720.

The previous prime is 2855906771. The next prime is 2855906797. The reversal of 2855906780 is 876095582.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 133079 + ... + 153041.

It is an arithmetic number, because the mean of its divisors is an integer number (130804128).

Almost surely, 2^2855906780 is an apocalyptic number.

2855906780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2855906780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3139299072).

2855906780 is an abundant number, since it is smaller than the sum of its proper divisors (3422691364).

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

2855906780 is a wasteful number, since it uses less digits than its factorization.

2855906780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20306 (or 20304 counting only the distinct ones).

The product of its (nonzero) digits is 1209600, while the sum is 50.

The square root of 2855906780 is about 53440.6846887276. The cubic root of 2855906780 is about 1418.7787522749.

The spelling of 2855906780 in words is "two billion, eight hundred fifty-five million, nine hundred six thousand, seven hundred eighty".