638897376 has 192 divisors, whose sum is σ = 1896652800. Its totient is φ = 186955776.

The previous prime is 638897359. The next prime is 638897377. The reversal of 638897376 is 673798836.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638897377) 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, 4596315 + ... + 4596453.

It is an arithmetic number, because the mean of its divisors is an integer number (9878400).

Almost surely, 2^638897376 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 638897376, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (948326400).

638897376 is an abundant number, since it is smaller than the sum of its proper divisors (1257755424).

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

638897376 is a wasteful number, since it uses less digits than its factorization.

638897376 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 321 (or 313 counting only the distinct ones).

The product of its digits is 9144576, while the sum is 57.

The square root of 638897376 is about 25276.4193666745. The cubic root of 638897376 is about 861.2786891521.

The spelling of 638897376 in words is "six hundred thirty-eight million, eight hundred ninety-seven thousand, three hundred seventy-six".