638022335 has 4 divisors (see below), whose sum is σ = 765626808. Its totient is φ = 510417864.

The previous prime is 638022311. The next prime is 638022349. The reversal of 638022335 is 533220836.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-638022335 is a prime.

It is a super-3 number, since 3×638022335³ (a number of 27 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 63802229 + ... + 63802238.

It is an arithmetic number, because the mean of its divisors is an integer number (191406702).

Almost surely, 2^638022335 is an apocalyptic number.

638022335 is a deficient number, since it is larger than the sum of its proper divisors (127604473).

638022335 is a wasteful number, since it uses less digits than its factorization.

638022335 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127604472.

The product of its (nonzero) digits is 25920, while the sum is 32.

The square root of 638022335 is about 25259.1040023196. The cubic root of 638022335 is about 860.8853038569.

The spelling of 638022335 in words is "six hundred thirty-eight million, twenty-two thousand, three hundred thirty-five".