7989728843 has 2 divisors, whose sum is σ = 7989728844. Its totient is φ = 7989728842.

The previous prime is 7989728801. The next prime is 7989728861. The reversal of 7989728843 is 3488279897.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 7989728843 - 2¹² = 7989724747 is a prime.

It is a super-2 number, since 2×7989728843² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 7989728843.

It is not a weakly prime, because it can be changed into another prime (7989728543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3994864421 + 3994864422.

It is an arithmetic number, because the mean of its divisors is an integer number (3994864422).

Almost surely, 2^7989728843 is an apocalyptic number.

7989728843 is a deficient number, since it is larger than the sum of its proper divisors (1).

7989728843 is an equidigital number, since it uses as much as digits as its factorization.

7989728843 is an evil number, because the sum of its binary digits is even.

The product of its digits is 48771072, while the sum is 65.

The square root of 7989728843 is about 89385.2831454933. The cubic root of 7989728843 is about 1999.1437036806.

The spelling of 7989728843 in words is "seven billion, nine hundred eighty-nine million, seven hundred twenty-eight thousand, eight hundred forty-three".