9928643805 has 12 divisors (see below), whose sum is σ = 17209649340. Its totient is φ = 5295276672.

The previous prime is 9928643789. The next prime is 9928643821. The reversal of 9928643805 is 5083468299.

It is an interprime number because it is at equal distance from previous prime (9928643789) and next prime (9928643821).

It can be written as a sum of positive squares in 2 ways, for example, as 1216474884 + 8712168921 = 34878^2 + 93339^2 .

It is not a de Polignac number, because 9928643805 - 2⁴ = 9928643789 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 110318220 + ... + 110318309.

It is an arithmetic number, because the mean of its divisors is an integer number (1434137445).

Almost surely, 2^9928643805 is an apocalyptic number.

It is an amenable number.

9928643805 is a deficient number, since it is larger than the sum of its proper divisors (7281005535).

9928643805 is a wasteful number, since it uses less digits than its factorization.

9928643805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 220636540 (or 220636537 counting only the distinct ones).

The product of its (nonzero) digits is 3732480, while the sum is 54.

The square root of 9928643805 is about 99642.5802807214. The cubic root of 9928643805 is about 2149.2980441435.

It can be divided in two parts, 99 and 28643805, that added together give a square (28643904 = 5352²).

The spelling of 9928643805 in words is "nine billion, nine hundred twenty-eight million, six hundred forty-three thousand, eight hundred five".