7749689789 has 2 divisors, whose sum is σ = 7749689790. Its totient is φ = 7749689788.

The previous prime is 7749689777. The next prime is 7749689797. The reversal of 7749689789 is 9879869477.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7078361689 + 671328100 = 84133^2 + 25910^2 .

It is a cyclic number.

It is not a de Polignac number, because 7749689789 - 2¹² = 7749685693 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7749683789) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3874844894 + 3874844895.

It is an arithmetic number, because the mean of its divisors is an integer number (3874844895).

Almost surely, 2^7749689789 is an apocalyptic number.

It is an amenable number.

7749689789 is a deficient number, since it is larger than the sum of its proper divisors (1).

7749689789 is an equidigital number, since it uses as much as digits as its factorization.

7749689789 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 384072192, while the sum is 74.

The square root of 7749689789 is about 88032.3224105783. The cubic root of 7749689789 is about 1978.9194005844.

The spelling of 7749689789 in words is "seven billion, seven hundred forty-nine million, six hundred eighty-nine thousand, seven hundred eighty-nine".