2789147778 has 8 divisors (see below), whose sum is σ = 5578295568. Its totient is φ = 929715924.

The previous prime is 2789147773. The next prime is 2789147783. The reversal of 2789147778 is 8777419872.

It is an interprime number because it is at equal distance from previous prime (2789147773) and next prime (2789147783).

It is a sphenic number, since it is the product of 3 distinct primes.

2789147778 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (2789147773) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 232428976 + ... + 232428987.

It is an arithmetic number, because the mean of its divisors is an integer number (697286946).

Almost surely, 2^2789147778 is an apocalyptic number.

2789147778 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

2789147778 is a wasteful number, since it uses less digits than its factorization.

2789147778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 464857968.

The product of its digits is 11063808, while the sum is 60.

The square root of 2789147778 is about 52812.3828093374. The cubic root of 2789147778 is about 1407.6364638165.

The spelling of 2789147778 in words is "two billion, seven hundred eighty-nine million, one hundred forty-seven thousand, seven hundred seventy-eight".