638384262 has 16 divisors (see below), whose sum is σ = 1280389680. Its totient is φ = 212191232.

The previous prime is 638384233. The next prime is 638384267. The reversal of 638384262 is 262483836.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638384267) 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 7 ways as a sum of consecutive naturals, for example, 148587 + ... + 152822.

It is an arithmetic number, because the mean of its divisors is an integer number (80024355).

Almost surely, 2^638384262 is an apocalyptic number.

638384262 is an abundant number, since it is smaller than the sum of its proper divisors (642005418).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

638384262 is a wasteful number, since it uses less digits than its factorization.

638384262 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 301767.

The product of its digits is 331776, while the sum is 42.

The square root of 638384262 is about 25266.2672747678. The cubic root of 638384262 is about 861.0480561209.

The spelling of 638384262 in words is "six hundred thirty-eight million, three hundred eighty-four thousand, two hundred sixty-two".