826644138 has 8 divisors (see below), whose sum is σ = 1653288288. Its totient is φ = 275548044.

The previous prime is 826644097. The next prime is 826644149. The reversal of 826644138 is 831446628.

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

826644138 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 826644138.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 68887006 + ... + 68887017.

It is an arithmetic number, because the mean of its divisors is an integer number (206661036).

Almost surely, 2^826644138 is an apocalyptic number.

826644138 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.

826644138 is a wasteful number, since it uses less digits than its factorization.

826644138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137774028.

The product of its digits is 221184, while the sum is 42.

The square root of 826644138 is about 28751.4197562486. The cubic root of 826644138 is about 938.5113520348.

The spelling of 826644138 in words is "eight hundred twenty-six million, six hundred forty-four thousand, one hundred thirty-eight".