827638638 has 16 divisors (see below), whose sum is σ = 1663124736. Its totient is φ = 274571640.

The previous prime is 827638633. The next prime is 827638639. The reversal of 827638638 is 836836728.

827638638 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×827638638² = 1369971430220990088, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (827638633) 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, 325606 + ... + 328137.

It is an arithmetic number, because the mean of its divisors is an integer number (103945296).

Almost surely, 2^827638638 is an apocalyptic number.

827638638 is an abundant number, since it is smaller than the sum of its proper divisors (835486098).

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

827638638 is a wasteful number, since it uses less digits than its factorization.

827638638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 653959.

The product of its digits is 2322432, while the sum is 51.

The square root of 827638638 is about 28768.7093558262. The cubic root of 827638638 is about 938.8875620852.

The spelling of 827638638 in words is "eight hundred twenty-seven million, six hundred thirty-eight thousand, six hundred thirty-eight".