2780664064 has 18 divisors (see below), whose sum is σ = 5550466670. Its totient is φ = 1390331904.

The previous prime is 2780664059. The next prime is 2780664151. The reversal of 2780664064 is 4604660872.

It can be written as a sum of positive squares in only one way, i.e., 2765918464 + 14745600 = 52592^2 + 3840^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 2780664064.

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 as a sum of consecutive naturals, namely, 5430729 + ... + 5431240.

Almost surely, 2^2780664064 is an apocalyptic number.

It is an amenable number.

2780664064 is a deficient number, since it is larger than the sum of its proper divisors (2769802606).

2780664064 is an equidigital number, since it uses as much as digits as its factorization.

2780664064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10861985 (or 10861971 counting only the distinct ones).

The product of its (nonzero) digits is 387072, while the sum is 43.

The square root of 2780664064 is about 52732.0022756580. The cubic root of 2780664064 is about 1406.2078179176.

The spelling of 2780664064 in words is "two billion, seven hundred eighty million, six hundred sixty-four thousand, sixty-four".