638345850 has 96 divisors (see below), whose sum is σ = 1691796480. Its totient is φ = 158811840.

The previous prime is 638345809. The next prime is 638345861. The reversal of 638345850 is 58543836.

It is an alternating number because its digits alternate between even and odd.

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 in 47 ways as a sum of consecutive naturals, for example, 189279 + ... + 192621.

It is an arithmetic number, because the mean of its divisors is an integer number (17622880).

Almost surely, 2^638345850 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 638345850, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (845898240).

638345850 is an abundant number, since it is smaller than the sum of its proper divisors (1053450630).

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

638345850 is a wasteful number, since it uses less digits than its factorization.

638345850 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3444 (or 3439 counting only the distinct ones).

The product of its (nonzero) digits is 345600, while the sum is 42.

The square root of 638345850 is about 25265.5071193911. The cubic root of 638345850 is about 861.0307858323.

The spelling of 638345850 in words is "six hundred thirty-eight million, three hundred forty-five thousand, eight hundred fifty".