2228128643 has 8 divisors (see below), whose sum is σ = 2412782736. Its totient is φ = 2045368800.

The previous prime is 2228128633. The next prime is 2228128673. The reversal of 2228128643 is 3468218222.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2228128643 - 2⁸ = 2228128387 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2228128597 and 2228128606.

It is not an unprimeable number, because it can be changed into a prime (2228128633) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 471113 + ... + 475818.

It is an arithmetic number, because the mean of its divisors is an integer number (301597842).

Almost surely, 2^2228128643 is an apocalyptic number.

2228128643 is a deficient number, since it is larger than the sum of its proper divisors (184654093).

2228128643 is a wasteful number, since it uses less digits than its factorization.

2228128643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 947125.

The product of its digits is 73728, while the sum is 38.

The square root of 2228128643 is about 47203.0575598658. The cubic root of 2228128643 is about 1306.1110003785. Note that the first 3 decimals are identical.

The spelling of 2228128643 in words is "two billion, two hundred twenty-eight million, one hundred twenty-eight thousand, six hundred forty-three".