2778943896 has 256 divisors, whose sum is σ = 8460288000. Its totient is φ = 841881600.

The previous prime is 2778943891. The next prime is 2778943987. The reversal of 2778943896 is 6983498772.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2778943891) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 21881385 + ... + 21881511.

It is an arithmetic number, because the mean of its divisors is an integer number (33048000).

Almost surely, 2^2778943896 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2778943896, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4230144000).

2778943896 is an abundant number, since it is smaller than the sum of its proper divisors (5681344104).

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

2778943896 is a wasteful number, since it uses less digits than its factorization.

2778943896 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 319 (or 309 counting only the distinct ones).

The product of its digits is 36578304, while the sum is 63.

The square root of 2778943896 is about 52715.6892774817. The cubic root of 2778943896 is about 1405.9177897565.

The spelling of 2778943896 in words is "two billion, seven hundred seventy-eight million, nine hundred forty-three thousand, eight hundred ninety-six".