2278220689 has 4 divisors (see below), whose sum is σ = 2278324224. Its totient is φ = 2278117156.

The previous prime is 2278220639. The next prime is 2278220701. The reversal of 2278220689 is 9860228722.

It is a happy number.

2278220689 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 9860228722 = 2 ⋅4930114361.

It is a cyclic number.

It is not a de Polignac number, because 2278220689 - 2⁷ = 2278220561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2278220629) 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, 4177 + ... + 67630.

It is an arithmetic number, because the mean of its divisors is an integer number (569581056).

Almost surely, 2^2278220689 is an apocalyptic number.

It is an amenable number.

2278220689 is a deficient number, since it is larger than the sum of its proper divisors (103535).

2278220689 is an equidigital number, since it uses as much as digits as its factorization.

2278220689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103534.

The product of its (nonzero) digits is 387072, while the sum is 46.

The square root of 2278220689 is about 47730.7101246147. The cubic root of 2278220689 is about 1315.8264047417.

The spelling of 2278220689 in words is "two billion, two hundred seventy-eight million, two hundred twenty thousand, six hundred eighty-nine".