7749809089 has 27 divisors (see below), whose sum is σ = 8740020387. Its totient is φ = 6866574000.

The previous prime is 7749809087. The next prime is 7749809099. The reversal of 7749809089 is 9809089477.

The square root of 7749809089 is 88033.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 5586815025 + 2162994064 = 74745^2 + 46508^2 .

It is not a de Polignac number, because 7749809089 - 2¹ = 7749809087 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7749809087) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 51323164 + ... + 51323314.

Almost surely, 2^7749809089 is an apocalyptic number.

7749809089 is the 88033-rd square number.

7749809089 is the 44017-th centered octagonal number.

It is an amenable number.

7749809089 is a deficient number, since it is larger than the sum of its proper divisors (990211298).

7749809089 is an equidigital number, since it uses as much as digits as its factorization.

7749809089 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 430 (or 215 counting only the distinct ones).

The product of its (nonzero) digits is 9144576, while the sum is 61.

The cubic root of 7749809089 is about 1978.9295551359.

The spelling of 7749809089 in words is "seven billion, seven hundred forty-nine million, eight hundred nine thousand, eighty-nine".