638202344 has 64 divisors (see below), whose sum is σ = 1381242240. Its totient is φ = 274095360.

The previous prime is 638202283. The next prime is 638202401. The reversal of 638202344 is 443202836.

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 638202344.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 84899 + ... + 92109.

It is an arithmetic number, because the mean of its divisors is an integer number (21581910).

Almost surely, 2^638202344 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 638202344, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (690621120).

638202344 is an abundant number, since it is smaller than the sum of its proper divisors (743039896).

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

638202344 is a wasteful number, since it uses less digits than its factorization.

638202344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7290 (or 7286 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 32.

The square root of 638202344 is about 25262.6670009324. The cubic root of 638202344 is about 860.9662584581.

The spelling of 638202344 in words is "six hundred thirty-eight million, two hundred two thousand, three hundred forty-four".