2778273891 has 32 divisors (see below), whose sum is σ = 4307627520. Its totient is φ = 1766410272.

The previous prime is 2778273851. The next prime is 2778273919. The reversal of 2778273891 is 1983728772.

It is not a de Polignac number, because 2778273891 - 2¹⁷ = 2778142819 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2778273811) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 209041 + ... + 221933.

It is an arithmetic number, because the mean of its divisors is an integer number (134613360).

Almost surely, 2^2778273891 is an apocalyptic number.

2778273891 is a deficient number, since it is larger than the sum of its proper divisors (1529353629).

2778273891 is a wasteful number, since it uses less digits than its factorization.

2778273891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13272 (or 13266 counting only the distinct ones).

The product of its digits is 2370816, while the sum is 54.

The square root of 2778273891 is about 52709.3340026223. The cubic root of 2778273891 is about 1405.8047914740.

The spelling of 2778273891 in words is "two billion, seven hundred seventy-eight million, two hundred seventy-three thousand, eight hundred ninety-one".