2778791264 has 12 divisors (see below), whose sum is σ = 5470745364. Its totient is φ = 1389395616.

The previous prime is 2778791243. The next prime is 2778791311. The reversal of 2778791264 is 4621978772.

It is a Smith number, since the sum of its digits (53) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43418582 + ... + 43418645.

It is an arithmetic number, because the mean of its divisors is an integer number (455895447).

Almost surely, 2^2778791264 is an apocalyptic number.

It is an amenable number.

2778791264 is a deficient number, since it is larger than the sum of its proper divisors (2691954100).

2778791264 is an equidigital number, since it uses as much as digits as its factorization.

2778791264 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86837237 (or 86837229 counting only the distinct ones).

The product of its digits is 2370816, while the sum is 53.

The square root of 2778791264 is about 52714.2415671515. The cubic root of 2778791264 is about 1405.8920495255.

The spelling of 2778791264 in words is "two billion, seven hundred seventy-eight million, seven hundred ninety-one thousand, two hundred sixty-four".