2778628844 has 6 divisors (see below), whose sum is σ = 4862600484. Its totient is φ = 1389314420.

The previous prime is 2778628789. The next prime is 2778628847. The reversal of 2778628844 is 4488268772.

2778628844 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 2778628844.

It is not an unprimeable number, because it can be changed into a prime (2778628847) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 347328602 + ... + 347328609.

It is an arithmetic number, because the mean of its divisors is an integer number (810433414).

Almost surely, 2^2778628844 is an apocalyptic number.

It is an amenable number.

2778628844 is a deficient number, since it is larger than the sum of its proper divisors (2083971640).

2778628844 is a wasteful number, since it uses less digits than its factorization.

2778628844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 694657215 (or 694657213 counting only the distinct ones).

The product of its digits is 9633792, while the sum is 56.

The square root of 2778628844 is about 52712.7009742434. The cubic root of 2778628844 is about 1405.8646575873.

The spelling of 2778628844 in words is "two billion, seven hundred seventy-eight million, six hundred twenty-eight thousand, eight hundred forty-four".