2778238682 has 8 divisors (see below), whose sum is σ = 4167581652. Its totient is φ = 1389044800.

The previous prime is 2778238637. The next prime is 2778238703. The reversal of 2778238682 is 2868328772.

2778238682 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Cunningham number, because it is equal to 52709²+1.

It can be written as a sum of positive squares in 2 ways, for example, as 2778238681 + 1 = 52709^2 + 1^2 .

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

It is a super-2 number, since 2×2778238682² = 15437220348322194248, which contains 22 as substring.

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, 55682 + ... + 93042.

Almost surely, 2^2778238682 is an apocalyptic number.

2778238682 is a deficient number, since it is larger than the sum of its proper divisors (1389342970).

2778238682 is a wasteful number, since it uses less digits than its factorization.

2778238682 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74544.

The product of its digits is 3612672, while the sum is 53.

The square root of 2778238682 is about 52709.0000094860. Note that the first 5 decimals coincide. The cubic root of 2778238682 is about 1405.7988528718.

The spelling of 2778238682 in words is "two billion, seven hundred seventy-eight million, two hundred thirty-eight thousand, six hundred eighty-two".