2778731136 has 64 divisors (see below), whose sum is σ = 8201126400. Its totient is φ = 926242560.

The previous prime is 2778731051. The next prime is 2778731147. The reversal of 2778731136 is 6311378772.

It is a tau number, because it is divible by the number of its divisors (64).

It is a junction number, because it is equal to n+sod(n) for n = 2778731091 and 2778731100.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 398560 + ... + 405471.

It is an arithmetic number, because the mean of its divisors is an integer number (128142600).

Almost surely, 2^2778731136 is an apocalyptic number.

It is an amenable number.

2778731136 is an abundant number, since it is smaller than the sum of its proper divisors (5422395264).

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

2778731136 is an equidigital number, since it uses as much as digits as its factorization.

2778731136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 804054 (or 804036 counting only the distinct ones).

The product of its digits is 296352, while the sum is 45.

The square root of 2778731136 is about 52713.6712438054. The cubic root of 2778731136 is about 1405.8819091349.

The spelling of 2778731136 in words is "two billion, seven hundred seventy-eight million, seven hundred thirty-one thousand, one hundred thirty-six".