2778257828 has 12 divisors (see below), whose sum is σ = 4862513712. Its totient is φ = 1388968200.

The previous prime is 2778257819. The next prime is 2778257857. The reversal of 2778257828 is 8287528772.

It is a happy number.

It is a super-3 number, since 3×2778257828³ (a number of 29 digits) contains 333 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, 4151 + ... + 74657.

It is an arithmetic number, because the mean of its divisors is an integer number (405209476).

Almost surely, 2^2778257828 is an apocalyptic number.

It is an amenable number.

2778257828 is a deficient number, since it is larger than the sum of its proper divisors (2084255884).

2778257828 is a wasteful number, since it uses less digits than its factorization.

2778257828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80362 (or 80360 counting only the distinct ones).

The product of its digits is 7024640, while the sum is 56.

The square root of 2778257828 is about 52709.1816290103. The cubic root of 2778257828 is about 1405.8020821796.

The spelling of 2778257828 in words is "two billion, seven hundred seventy-eight million, two hundred fifty-seven thousand, eight hundred twenty-eight".