638332265 has 32 divisors (see below), whose sum is σ = 830632320. Its totient is φ = 469407744.

The previous prime is 638332237. The next prime is 638332267. The reversal of 638332265 is 562233836.

It is a cyclic number.

It is not a de Polignac number, because 638332265 - 2¹⁰ = 638331241 is a prime.

It is not an unprimeable number, because it can be changed into a prime (638332267) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 487742 + ... + 489048.

It is an arithmetic number, because the mean of its divisors is an integer number (25957260).

Almost surely, 2^638332265 is an apocalyptic number.

It is an amenable number.

638332265 is a deficient number, since it is larger than the sum of its proper divisors (192300055).

638332265 is a wasteful number, since it uses less digits than its factorization.

638332265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1481.

The product of its digits is 155520, while the sum is 38.

The square root of 638332265 is about 25265.2382731689. The cubic root of 638332265 is about 861.0246777608.

The spelling of 638332265 in words is "six hundred thirty-eight million, three hundred thirty-two thousand, two hundred sixty-five".