228787639 has 2 divisors, whose sum is σ = 228787640. Its totient is φ = 228787638.

The previous prime is 228787633. The next prime is 228787661. The reversal of 228787639 is 936787822.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-228787639 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (228787633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 114393819 + 114393820.

It is an arithmetic number, because the mean of its divisors is an integer number (114393820).

Almost surely, 2^228787639 is an apocalyptic number.

228787639 is a deficient number, since it is larger than the sum of its proper divisors (1).

228787639 is an equidigital number, since it uses as much as digits as its factorization.

228787639 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2032128, while the sum is 52.

The square root of 228787639 is about 15125.7277180306. The cubic root of 228787639 is about 611.6141420876.

The spelling of 228787639 in words is "two hundred twenty-eight million, seven hundred eighty-seven thousand, six hundred thirty-nine".