638927360 has 160 divisors (see below), whose sum is σ = 1616896512. Its totient is φ = 241827840.

The previous prime is 638927339. The next prime is 638927363. The reversal of 638927360 is 63729836.

It is a tau number, because it is divible by the number of its divisors (160).

It is not an unprimeable number, because it can be changed into a prime (638927363) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6586832 + ... + 6586928.

Almost surely, 2^638927360 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 638927360, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (808448256).

638927360 is an abundant number, since it is smaller than the sum of its proper divisors (977969152).

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

638927360 is an equidigital number, since it uses as much as digits as its factorization.

638927360 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 234 (or 218 counting only the distinct ones).

The product of its (nonzero) digits is 326592, while the sum is 44.

The square root of 638927360 is about 25277.0124816997. The cubic root of 638927360 is about 861.2921624564.

The spelling of 638927360 in words is "six hundred thirty-eight million, nine hundred twenty-seven thousand, three hundred sixty".