7728246991 has 2 divisors, whose sum is σ = 7728246992. Its totient is φ = 7728246990.

The previous prime is 7728246973. The next prime is 7728247013. The reversal of 7728246991 is 1996428277.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 7728246991 - 2¹¹ = 7728244943 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7728246931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3864123495 + 3864123496.

It is an arithmetic number, because the mean of its divisors is an integer number (3864123496).

Almost surely, 2^7728246991 is an apocalyptic number.

7728246991 is a deficient number, since it is larger than the sum of its proper divisors (1).

7728246991 is an equidigital number, since it uses as much as digits as its factorization.

7728246991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3048192, while the sum is 55.

The square root of 7728246991 is about 87910.4487020741. The cubic root of 7728246991 is about 1977.0925418238.

The spelling of 7728246991 in words is "seven billion, seven hundred twenty-eight million, two hundred forty-six thousand, nine hundred ninety-one".