7887780349 has 2 divisors, whose sum is σ = 7887780350. Its totient is φ = 7887780348.

The previous prime is 7887780301. The next prime is 7887780353. The reversal of 7887780349 is 9430877887.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7515676249 + 372104100 = 86693^2 + 19290^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7887780349 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7887780049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3943890174 + 3943890175.

It is an arithmetic number, because the mean of its divisors is an integer number (3943890175).

Almost surely, 2^7887780349 is an apocalyptic number.

It is an amenable number.

7887780349 is a deficient number, since it is larger than the sum of its proper divisors (1).

7887780349 is an equidigital number, since it uses as much as digits as its factorization.

7887780349 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18966528, while the sum is 61.

The square root of 7887780349 is about 88813.1766631506. The cubic root of 7887780349 is about 1990.6042918716.

The spelling of 7887780349 in words is "seven billion, eight hundred eighty-seven million, seven hundred eighty thousand, three hundred forty-nine".