826781564604 has 144 divisors (see below), whose sum is σ = 2080610155008. Its totient is φ = 254863204992.

The previous prime is 826781564603. The next prime is 826781564633. The reversal of 826781564604 is 406465187628.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (826781564603) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 284801017 + ... + 284803919.

It is an arithmetic number, because the mean of its divisors is an integer number (14448681632).

Almost surely, 2^826781564604 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 826781564604, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1040305077504).

826781564604 is an abundant number, since it is smaller than the sum of its proper divisors (1253828590404).

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

826781564604 is a wasteful number, since it uses less digits than its factorization.

826781564604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3304 (or 3135 counting only the distinct ones).

The product of its (nonzero) digits is 15482880, while the sum is 57.

The spelling of 826781564604 in words is "eight hundred twenty-six billion, seven hundred eighty-one million, five hundred sixty-four thousand, six hundred four".