2005342778 has 4 divisors (see below), whose sum is σ = 3008014170. Its totient is φ = 1002671388.

The previous prime is 2005342771. The next prime is 2005342813. The reversal of 2005342778 is 8772435002.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1216126129 + 789216649 = 34873^2 + 28093^2 .

It is not an unprimeable number, because it can be changed into a prime (2005342771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 501335693 + ... + 501335696.

Almost surely, 2^2005342778 is an apocalyptic number.

2005342778 is a deficient number, since it is larger than the sum of its proper divisors (1002671392).

2005342778 is a wasteful number, since it uses less digits than its factorization.

2005342778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1002671391.

The product of its (nonzero) digits is 94080, while the sum is 38.

The square root of 2005342778 is about 44781.0537839386. The cubic root of 2005342778 is about 1261.0419654307.

The spelling of 2005342778 in words is "two billion, five million, three hundred forty-two thousand, seven hundred seventy-eight".