8223991747 has 4 divisors (see below), whose sum is σ = 8265738096. Its totient is φ = 8182245400.

The previous prime is 8223991729. The next prime is 8223991771. The reversal of 8223991747 is 7471993228.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 8223991747 - 2¹¹ = 8223989699 is a prime.

It is a super-2 number, since 2×8223991747² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 8223991694 and 8223991703.

It is not an unprimeable number, because it can be changed into a prime (8223991717) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20872879 + ... + 20873272.

It is an arithmetic number, because the mean of its divisors is an integer number (2066434524).

Almost surely, 2^8223991747 is an apocalyptic number.

8223991747 is a deficient number, since it is larger than the sum of its proper divisors (41746349).

8223991747 is a wasteful number, since it uses less digits than its factorization.

8223991747 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41746348.

The product of its digits is 1524096, while the sum is 52.

The square root of 8223991747 is about 90686.2268869976. The cubic root of 8223991747 is about 2018.4944297911.

The spelling of 8223991747 in words is "eight billion, two hundred twenty-three million, nine hundred ninety-one thousand, seven hundred forty-seven".