2278644443 has 2 divisors, whose sum is σ = 2278644444. Its totient is φ = 2278644442.

The previous prime is 2278644437. The next prime is 2278644449. The reversal of 2278644443 is 3444468722.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (2278644437) and next prime (2278644449).

It is a cyclic number.

It is not a de Polignac number, because 2278644443 - 2⁴ = 2278644427 is a prime.

It is a super-2 number, since 2×2278644443² = 10384440995229560498, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2278644394 and 2278644403.

It is not a weakly prime, because it can be changed into another prime (2278644449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1139322221 + 1139322222.

It is an arithmetic number, because the mean of its divisors is an integer number (1139322222).

Almost surely, 2^2278644443 is an apocalyptic number.

2278644443 is a deficient number, since it is larger than the sum of its proper divisors (1).

2278644443 is an equidigital number, since it uses as much as digits as its factorization.

2278644443 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1032192, while the sum is 44.

The square root of 2278644443 is about 47735.1489261320. The cubic root of 2278644443 is about 1315.9079818745.

The spelling of 2278644443 in words is "two billion, two hundred seventy-eight million, six hundred forty-four thousand, four hundred forty-three".