638332267 has 2 divisors, whose sum is σ = 638332268. Its totient is φ = 638332266.

The previous prime is 638332237. The next prime is 638332307. The reversal of 638332267 is 762233836.

It is an a-pointer prime, because the next prime (638332307) can be obtained adding 638332267 to its sum of digits (40).

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-638332267 is a prime.

It is a super-3 number, since 3×638332267³ (a number of 27 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (638332217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 319166133 + 319166134.

It is an arithmetic number, because the mean of its divisors is an integer number (319166134).

Almost surely, 2^638332267 is an apocalyptic number.

638332267 is a deficient number, since it is larger than the sum of its proper divisors (1).

638332267 is an equidigital number, since it uses as much as digits as its factorization.

638332267 is an evil number, because the sum of its binary digits is even.

The product of its digits is 217728, while the sum is 40.

The square root of 638332267 is about 25265.2383127490. The cubic root of 638332267 is about 861.0246786601.

The spelling of 638332267 in words is "six hundred thirty-eight million, three hundred thirty-two thousand, two hundred sixty-seven".