9629628781 has 2 divisors, whose sum is σ = 9629628782. Its totient is φ = 9629628780.

The previous prime is 9629628737. The next prime is 9629628791. The reversal of 9629628781 is 1878269269.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5064599556 + 4565029225 = 71166^2 + 67565^2 .

It is a cyclic number.

It is not a de Polignac number, because 9629628781 - 2⁹ = 9629628269 is a prime.

It is a super-2 number, since 2×9629628781² (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 (9629628721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4814814390 + 4814814391.

It is an arithmetic number, because the mean of its divisors is an integer number (4814814391).

Almost surely, 2^9629628781 is an apocalyptic number.

It is an amenable number.

9629628781 is a deficient number, since it is larger than the sum of its proper divisors (1).

9629628781 is an equidigital number, since it uses as much as digits as its factorization.

9629628781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5225472, while the sum is 58.

The square root of 9629628781 is about 98130.6719685543. The cubic root of 9629628781 is about 2127.5013704566.

The spelling of 9629628781 in words is "nine billion, six hundred twenty-nine million, six hundred twenty-eight thousand, seven hundred eighty-one".