2780021768 has 16 divisors (see below), whose sum is σ = 5264151660. Its totient is φ = 1376248000.

The previous prime is 2780021743. The next prime is 2780021789. The reversal of 2780021768 is 8671200872.

It can be written as a sum of positive squares in 2 ways, for example, as 2321119684 + 458902084 = 48178^2 + 21422^2 .

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 3 ways as a sum of consecutive naturals, for example, 1719503 + ... + 1721118.

Almost surely, 2^2780021768 is an apocalyptic number.

It is an amenable number.

2780021768 is a deficient number, since it is larger than the sum of its proper divisors (2484129892).

2780021768 is a wasteful number, since it uses less digits than its factorization.

2780021768 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3440728 (or 3440724 counting only the distinct ones).

The product of its (nonzero) digits is 75264, while the sum is 41.

The square root of 2780021768 is about 52725.9117322783. The cubic root of 2780021768 is about 1406.0995378824.

The spelling of 2780021768 in words is "two billion, seven hundred eighty million, twenty-one thousand, seven hundred sixty-eight".