2778356782 has 8 divisors (see below), whose sum is σ = 4171372416. Its totient is φ = 1387899312.

The previous prime is 2778356761. The next prime is 2778356821. The reversal of 2778356782 is 2876538772.

2778356782 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 636823 + ... + 641170.

It is an arithmetic number, because the mean of its divisors is an integer number (521421552).

Almost surely, 2^2778356782 is an apocalyptic number.

2778356782 is a deficient number, since it is larger than the sum of its proper divisors (1393015634).

2778356782 is a wasteful number, since it uses less digits than its factorization.

2778356782 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1279082.

The product of its digits is 7902720, while the sum is 55.

The square root of 2778356782 is about 52710.1202996161. The cubic root of 2778356782 is about 1405.8187722657.

The spelling of 2778356782 in words is "two billion, seven hundred seventy-eight million, three hundred fifty-six thousand, seven hundred eighty-two".