228644639 has 2 divisors, whose sum is σ = 228644640. Its totient is φ = 228644638.

The previous prime is 228644629. The next prime is 228644681. The reversal of 228644639 is 936446822.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-228644639 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 228644639.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (228644609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 114322319 + 114322320.

It is an arithmetic number, because the mean of its divisors is an integer number (114322320).

Almost surely, 2^228644639 is an apocalyptic number.

228644639 is a deficient number, since it is larger than the sum of its proper divisors (1).

228644639 is an equidigital number, since it uses as much as digits as its factorization.

228644639 is an evil number, because the sum of its binary digits is even.

The product of its digits is 497664, while the sum is 44.

The square root of 228644639 is about 15120.9999338668. Note that the first 4 decimals coincide. The cubic root of 228644639 is about 611.4866890325.

The spelling of 228644639 in words is "two hundred twenty-eight million, six hundred forty-four thousand, six hundred thirty-nine".