1987780763 has 2 divisors, whose sum is σ = 1987780764. Its totient is φ = 1987780762.

The previous prime is 1987780757. The next prime is 1987780867. The reversal of 1987780763 is 3670877891.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1987780763 - 2⁴ = 1987780747 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1987780699 and 1987780708.

It is not a weakly prime, because it can be changed into another prime (1987780733) 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, 993890381 + 993890382.

It is an arithmetic number, because the mean of its divisors is an integer number (993890382).

Almost surely, 2^1987780763 is an apocalyptic number.

1987780763 is a deficient number, since it is larger than the sum of its proper divisors (1).

1987780763 is an equidigital number, since it uses as much as digits as its factorization.

1987780763 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3556224, while the sum is 56.

The square root of 1987780763 is about 44584.5350205651. The cubic root of 1987780763 is about 1257.3499275868.

The spelling of 1987780763 in words is "one billion, nine hundred eighty-seven million, seven hundred eighty thousand, seven hundred sixty-three".