638582632787 has 8 divisors (see below), whose sum is σ = 697008752832. Its totient is φ = 580218705000.

The previous prime is 638582632781. The next prime is 638582632799. The reversal of 638582632787 is 787236285836.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 638582632787 - 2⁴ = 638582632771 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (638582632781) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15526589 + ... + 15567662.

It is an arithmetic number, because the mean of its divisors is an integer number (87126094104).

Almost surely, 2^638582632787 is an apocalyptic number.

638582632787 is a deficient number, since it is larger than the sum of its proper divisors (58426120045).

638582632787 is a wasteful number, since it uses less digits than its factorization.

638582632787 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31096129.

The product of its digits is 162570240, while the sum is 65.

The spelling of 638582632787 in words is "six hundred thirty-eight billion, five hundred eighty-two million, six hundred thirty-two thousand, seven hundred eighty-seven".