638283806 has 4 divisors (see below), whose sum is σ = 957425712. Its totient is φ = 319141902.

The previous prime is 638283761. The next prime is 638283817. The reversal of 638283806 is 608382836.

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

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 159570950 + ... + 159570953.

It is an arithmetic number, because the mean of its divisors is an integer number (239356428).

Almost surely, 2^638283806 is an apocalyptic number.

638283806 is a deficient number, since it is larger than the sum of its proper divisors (319141906).

638283806 is a wasteful number, since it uses less digits than its factorization.

638283806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 319141905.

The product of its (nonzero) digits is 331776, while the sum is 44.

The square root of 638283806 is about 25264.2792495650. The cubic root of 638283806 is about 861.0028889772.

The spelling of 638283806 in words is "six hundred thirty-eight million, two hundred eighty-three thousand, eight hundred six".