638282670 has 64 divisors (see below), whose sum is σ = 1575153216. Its totient is φ = 165432320.

The previous prime is 638282651. The next prime is 638282677. The reversal of 638282670 is 76282836.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638282677) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 389092 + ... + 390728.

It is an arithmetic number, because the mean of its divisors is an integer number (24611769).

Almost surely, 2^638282670 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 638282670, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (787576608).

638282670 is an abundant number, since it is smaller than the sum of its proper divisors (936870546).

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

638282670 is a wasteful number, since it uses less digits than its factorization.

638282670 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2005.

The product of its (nonzero) digits is 193536, while the sum is 42.

The square root of 638282670 is about 25264.2567672196. The cubic root of 638282670 is about 861.0023781805.

The spelling of 638282670 in words is "six hundred thirty-eight million, two hundred eighty-two thousand, six hundred seventy".