2778216774 has 32 divisors (see below), whose sum is σ = 5661518976. Its totient is φ = 908666880.

The previous prime is 2778216739. The next prime is 2778216781. The reversal of 2778216774 is 4776128772.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 89869 + ... + 116759.

It is an arithmetic number, because the mean of its divisors is an integer number (176922468).

Almost surely, 2^2778216774 is an apocalyptic number.

2778216774 is an abundant number, since it is smaller than the sum of its proper divisors (2883302202).

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

2778216774 is a wasteful number, since it uses less digits than its factorization.

2778216774 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27220.

The product of its digits is 1843968, while the sum is 51.

The square root of 2778216774 is about 52708.7921887800. The cubic root of 2778216774 is about 1405.7951576863.

The spelling of 2778216774 in words is "two billion, seven hundred seventy-eight million, two hundred sixteen thousand, seven hundred seventy-four".