638101320 has 128 divisors (see below), whose sum is σ = 2025216000. Its totient is φ = 160392960.

The previous prime is 638101309. The next prime is 638101357. The reversal of 638101320 is 23101836.

It is a Harshad number since it is a multiple of its sum of digits (24).

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 31 ways as a sum of consecutive naturals, for example, 544335 + ... + 545505.

It is an arithmetic number, because the mean of its divisors is an integer number (15822000).

Almost surely, 2^638101320 is an apocalyptic number.

638101320 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 638101320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1012608000).

638101320 is an abundant number, since it is smaller than the sum of its proper divisors (1387114680).

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

638101320 is a wasteful number, since it uses less digits than its factorization.

638101320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1443 (or 1439 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 638101320 is about 25260.6674496142. The cubic root of 638101320 is about 860.9208272842.

The spelling of 638101320 in words is "six hundred thirty-eight million, one hundred one thousand, three hundred twenty".