8223643444 has 24 divisors (see below), whose sum is σ = 15452555328. Its totient is φ = 3815441280.

The previous prime is 8223643423. The next prime is 8223643453. The reversal of 8223643444 is 4443463228.

It is a happy number.

It is a super-2 number, since 2×8223643444² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 8223643397 and 8223643406.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 846834 + ... + 856489.

It is an arithmetic number, because the mean of its divisors is an integer number (643856472).

Almost surely, 2^8223643444 is an apocalyptic number.

It is an amenable number.

8223643444 is a deficient number, since it is larger than the sum of its proper divisors (7228911884).

8223643444 is a wasteful number, since it uses less digits than its factorization.

8223643444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1703415 (or 1703413 counting only the distinct ones).

The product of its digits is 442368, while the sum is 40.

The square root of 8223643444 is about 90684.3064923584. The cubic root of 8223643444 is about 2018.4659335890.

The spelling of 8223643444 in words is "eight billion, two hundred twenty-three million, six hundred forty-three thousand, four hundred forty-four".