827791638 has 8 divisors (see below), whose sum is σ = 1655583288. Its totient is φ = 275930544.

The previous prime is 827791637. The next prime is 827791649. The reversal of 827791638 is 836197728.

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

827791638 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (827791637) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 68982631 + ... + 68982642.

It is an arithmetic number, because the mean of its divisors is an integer number (206947911).

Almost surely, 2^827791638 is an apocalyptic number.

827791638 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

827791638 is a wasteful number, since it uses less digits than its factorization.

827791638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137965278.

The product of its digits is 1016064, while the sum is 51.

The square root of 827791638 is about 28771.3683720465. The cubic root of 827791638 is about 938.9454138011.

The spelling of 827791638 in words is "eight hundred twenty-seven million, seven hundred ninety-one thousand, six hundred thirty-eight".