2778565860 has 144 divisors (see below), whose sum is σ = 9790540032. Its totient is φ = 624672000.

The previous prime is 2778565843. The next prime is 2778565861. The reversal of 2778565860 is 685658772.

2778565860 is a `hidden beast` number, since 2 + 7 + 7 + 8 + 56 + 586 + 0 = 666.

2778565860 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 2778565797 and 2778565806.

It is not an unprimeable number, because it can be changed into a prime (2778565861) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 58785 + ... + 94935.

Almost surely, 2^2778565860 is an apocalyptic number.

2778565860 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 2778565860, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4895270016).

2778565860 is an abundant number, since it is smaller than the sum of its proper divisors (7011974172).

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

2778565860 is a wasteful number, since it uses less digits than its factorization.

2778565860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36234 (or 36229 counting only the distinct ones).

The product of its (nonzero) digits is 5644800, while the sum is 54.

The square root of 2778565860 is about 52712.1035436834. The cubic root of 2778565860 is about 1405.8540351241.

The spelling of 2778565860 in words is "two billion, seven hundred seventy-eight million, five hundred sixty-five thousand, eight hundred sixty".