7989320690 has 32 divisors (see below), whose sum is σ = 15553517616. Its totient is φ = 2937231360.

The previous prime is 7989320683. The next prime is 7989320723. The reversal of 7989320690 is 960239897.

It is a Cunningham number, because it is equal to 89383²+1.

It can be written as a sum of positive squares in 8 ways, for example, as 1181915641 + 6807405049 = 34379^2 + 82507^2 .

It is a super-2 number, since 2×7989320690² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 101591 + ... + 162170.

Almost surely, 2^7989320690 is an apocalyptic number.

7989320690 is a deficient number, since it is larger than the sum of its proper divisors (7564196926).

7989320690 is a wasteful number, since it uses less digits than its factorization.

7989320690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 264014.

The product of its (nonzero) digits is 1469664, while the sum is 53.

The square root of 7989320690 is about 89383.0000055939. Note that the first 5 decimals coincide. The cubic root of 7989320690 is about 1999.1096612072.

The spelling of 7989320690 in words is "seven billion, nine hundred eighty-nine million, three hundred twenty thousand, six hundred ninety".