8099628781 has 2 divisors, whose sum is σ = 8099628782. Its totient is φ = 8099628780.

The previous prime is 8099628763. The next prime is 8099628821. The reversal of 8099628781 is 1878269908.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7414759881 + 684868900 = 86109^2 + 26170^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8099628781 is a prime.

It is a super-2 number, since 2×8099628781² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8099628701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4049814390 + 4049814391.

It is an arithmetic number, because the mean of its divisors is an integer number (4049814391).

Almost surely, 2^8099628781 is an apocalyptic number.

It is an amenable number.

8099628781 is a deficient number, since it is larger than the sum of its proper divisors (1).

8099628781 is an equidigital number, since it uses as much as digits as its factorization.

8099628781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3483648, while the sum is 58.

The square root of 8099628781 is about 89997.9376485928. The cubic root of 8099628781 is about 2008.2681699963.

The spelling of 8099628781 in words is "eight billion, ninety-nine million, six hundred twenty-eight thousand, seven hundred eighty-one".