2778649922 has 4 divisors (see below), whose sum is σ = 4167974886. Its totient is φ = 1389324960.

The previous prime is 2778649919. The next prime is 2778649931. The reversal of 2778649922 is 2299468772.

2778649922 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 2073800521 + 704849401 = 45539^2 + 26549^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 694662479 + ... + 694662482.

Almost surely, 2^2778649922 is an apocalyptic number.

2778649922 is a deficient number, since it is larger than the sum of its proper divisors (1389324964).

2778649922 is a wasteful number, since it uses less digits than its factorization.

2778649922 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1389324963.

The product of its digits is 6096384, while the sum is 56.

The square root of 2778649922 is about 52712.9009067040. The cubic root of 2778649922 is about 1405.8682124270.

The spelling of 2778649922 in words is "two billion, seven hundred seventy-eight million, six hundred forty-nine thousand, nine hundred twenty-two".