638323350 has 96 divisors (see below), whose sum is σ = 1871665920. Its totient is φ = 140864640.

The previous prime is 638323339. The next prime is 638323391. The reversal of 638323350 is 53323836.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 19969 + ... + 40931.

It is an arithmetic number, because the mean of its divisors is an integer number (19496520).

Almost surely, 2^638323350 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 638323350, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (935832960).

638323350 is an abundant number, since it is smaller than the sum of its proper divisors (1233342570).

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

638323350 is a wasteful number, since it uses less digits than its factorization.

638323350 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21014 (or 21009 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 33.

The square root of 638323350 is about 25265.0618443732. The cubic root of 638323350 is about 861.0206693621.

The spelling of 638323350 in words is "six hundred thirty-eight million, three hundred twenty-three thousand, three hundred fifty".