2778725678 has 8 divisors (see below), whose sum is σ = 4280739672. Its totient is φ = 1351812456.

The previous prime is 2778725671. The next prime is 2778725687. The reversal of 2778725678 is 8765278772.

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

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2778725671) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18775100 + ... + 18775247.

It is an arithmetic number, because the mean of its divisors is an integer number (535092459).

Almost surely, 2^2778725678 is an apocalyptic number.

2778725678 is a deficient number, since it is larger than the sum of its proper divisors (1502013994).

2778725678 is a wasteful number, since it uses less digits than its factorization.

2778725678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37550386.

The product of its digits is 18439680, while the sum is 59.

The square root of 2778725678 is about 52713.6194735289. The cubic root of 2778725678 is about 1405.8809886538.

The spelling of 2778725678 in words is "two billion, seven hundred seventy-eight million, seven hundred twenty-five thousand, six hundred seventy-eight".