2778656118 has 32 divisors (see below), whose sum is σ = 6522872064. Its totient is φ = 772444512.

The previous prime is 2778656113. The next prime is 2778656123. The reversal of 2778656118 is 8116568772.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (2778656113) and next prime (2778656123).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2778656113) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 892480 + ... + 895587.

It is an arithmetic number, because the mean of its divisors is an integer number (203839752).

Almost surely, 2^2778656118 is an apocalyptic number.

2778656118 is an abundant number, since it is smaller than the sum of its proper divisors (3744215946).

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

2778656118 is a wasteful number, since it uses less digits than its factorization.

2778656118 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1788116.

The product of its digits is 1128960, while the sum is 51.

The square root of 2778656118 is about 52712.9596778629. The cubic root of 2778656118 is about 1405.8692573893.

The spelling of 2778656118 in words is "two billion, seven hundred seventy-eight million, six hundred fifty-six thousand, one hundred eighteen".