2778920825 has 24 divisors (see below), whose sum is σ = 3523762560. Its totient is φ = 2173003200.

The previous prime is 2778920813. The next prime is 2778920839. The reversal of 2778920825 is 5280298772.

It is not a de Polignac number, because 2778920825 - 2²⁴ = 2762143609 is a prime.

It is a Smith number, since the sum of its digits (50) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1713515 + ... + 1715135.

It is an arithmetic number, because the mean of its divisors is an integer number (146823440).

Almost surely, 2^2778920825 is an apocalyptic number.

2778920825 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

2778920825 is a deficient number, since it is larger than the sum of its proper divisors (744841735).

2778920825 is a wasteful number, since it uses less digits than its factorization.

2778920825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3137 (or 3132 counting only the distinct ones).

The product of its (nonzero) digits is 1128960, while the sum is 50.

The square root of 2778920825 is about 52715.4704522306. The cubic root of 2778920825 is about 1405.9138990675.

The spelling of 2778920825 in words is "two billion, seven hundred seventy-eight million, nine hundred twenty thousand, eight hundred twenty-five".