5646748778 has 16 divisors (see below), whose sum is σ = 9286574400. Its totient is φ = 2553804000.

The previous prime is 5646748741. The next prime is 5646748799. The reversal of 5646748778 is 8778476465.

It is a happy number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 5646748778.

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 7 ways as a sum of consecutive naturals, for example, 640523 + ... + 649278.

It is an arithmetic number, because the mean of its divisors is an integer number (580410900).

Almost surely, 2^5646748778 is an apocalyptic number.

5646748778 is a deficient number, since it is larger than the sum of its proper divisors (3639825622).

5646748778 is a wasteful number, since it uses less digits than its factorization.

5646748778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1290013.

The product of its digits is 63221760, while the sum is 62.

The square root of 5646748778 is about 75144.8519727067. The cubic root of 5646748778 is about 1780.7357958328.

The spelling of 5646748778 in words is "five billion, six hundred forty-six million, seven hundred forty-eight thousand, seven hundred seventy-eight".