3640780777 has 2 divisors, whose sum is σ = 3640780778. Its totient is φ = 3640780776.

The previous prime is 3640780747. The next prime is 3640780811. The reversal of 3640780777 is 7770870463.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3591724761 + 49056016 = 59931^2 + 7004^2 .

It is a cyclic number.

It is not a de Polignac number, because 3640780777 - 2¹⁹ = 3640256489 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 3640780777.

It is not a weakly prime, because it can be changed into another prime (3640780747) 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, 1820390388 + 1820390389.

It is an arithmetic number, because the mean of its divisors is an integer number (1820390389).

Almost surely, 2^3640780777 is an apocalyptic number.

It is an amenable number.

3640780777 is a deficient number, since it is larger than the sum of its proper divisors (1).

3640780777 is an equidigital number, since it uses as much as digits as its factorization.

3640780777 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1382976, while the sum is 49.

The square root of 3640780777 is about 60338.8827954247. The cubic root of 3640780777 is about 1538.3843145256.

The spelling of 3640780777 in words is "three billion, six hundred forty million, seven hundred eighty thousand, seven hundred seventy-seven".