638762283656 has 64 divisors (see below), whose sum is σ = 1397523456000. Its totient is φ = 268042824000.

The previous prime is 638762283641. The next prime is 638762283671. The reversal of 638762283656 is 656382267836.

It is an interprime number because it is at equal distance from previous prime (638762283641) and next prime (638762283671).

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, 444185 + ... + 1214423.

It is an arithmetic number, because the mean of its divisors is an integer number (21836304000).

Almost surely, 2^638762283656 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 638762283656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (698761728000).

638762283656 is an abundant number, since it is smaller than the sum of its proper divisors (758761172344).

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

638762283656 is a wasteful number, since it uses less digits than its factorization.

638762283656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 770562 (or 770558 counting only the distinct ones).

The product of its digits is 104509440, while the sum is 62.

The spelling of 638762283656 in words is "six hundred thirty-eight billion, seven hundred sixty-two million, two hundred eighty-three thousand, six hundred fifty-six".