2778746916 has 72 divisors (see below), whose sum is σ = 7269980256. Its totient is φ = 819233280.

The previous prime is 2778746897. The next prime is 2778746921. The reversal of 2778746916 is 6196478772.

It is a super-2 number, since 2×2778746916² = 15442868846359022112, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 173020 + ... + 188396.

It is an arithmetic number, because the mean of its divisors is an integer number (100971948).

Almost surely, 2^2778746916 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 2778746916, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3634990128).

2778746916 is an abundant number, since it is smaller than the sum of its proper divisors (4491233340).

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

2778746916 is a wasteful number, since it uses less digits than its factorization.

2778746916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15469 (or 15430 counting only the distinct ones).

The product of its digits is 7112448, while the sum is 57.

The square root of 2778746916 is about 52713.8209201344. The cubic root of 2778746916 is about 1405.8845703945.

The spelling of 2778746916 in words is "two billion, seven hundred seventy-eight million, seven hundred forty-six thousand, nine hundred sixteen".