638636345382 has 32 divisors (see below), whose sum is σ = 1545607291392. Its totient is φ = 171734143104.

The previous prime is 638636345371. The next prime is 638636345429. The reversal of 638636345382 is 283543636836.

It is a super-3 number, since 3×638636345382³ (a number of 36 digits) contains 333 as substring.

It is a congruent number.

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, 447223618 + ... + 447225045.

It is an arithmetic number, because the mean of its divisors is an integer number (48300227856).

Almost surely, 2^638636345382 is an apocalyptic number.

638636345382 is an abundant number, since it is smaller than the sum of its proper divisors (906970946010).

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

638636345382 is a wasteful number, since it uses less digits than its factorization.

638636345382 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 894448692.

The product of its digits is 44789760, while the sum is 57.

The spelling of 638636345382 in words is "six hundred thirty-eight billion, six hundred thirty-six million, three hundred forty-five thousand, three hundred eighty-two".