2781392978 has 48 divisors (see below), whose sum is σ = 5337892224. Its totient is φ = 1076896800.

The previous prime is 2781392969. The next prime is 2781392981. The reversal of 2781392978 is 8792931872.

It is a super-2 number, since 2×2781392978² = 15472293796135416968, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 36653 + ... + 83103.

It is an arithmetic number, because the mean of its divisors is an integer number (111206088).

Almost surely, 2^2781392978 is an apocalyptic number.

2781392978 is a deficient number, since it is larger than the sum of its proper divisors (2556499246).

2781392978 is a wasteful number, since it uses less digits than its factorization.

2781392978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46527 (or 46520 counting only the distinct ones).

The product of its digits is 3048192, while the sum is 56.

The square root of 2781392978 is about 52738.9133183459. The cubic root of 2781392978 is about 1406.3306800578.

The spelling of 2781392978 in words is "two billion, seven hundred eighty-one million, three hundred ninety-two thousand, nine hundred seventy-eight".