1781368270836 has 96 divisors (see below), whose sum is σ = 5186179783680. Its totient is φ = 462334348800.

The previous prime is 1781368270819. The next prime is 1781368270861. The reversal of 1781368270836 is 6380728631871.

It is a happy number.

It is a Smith number, since the sum of its digits (60) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 1781368270836.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 446220 + ... + 1939548.

It is an arithmetic number, because the mean of its divisors is an integer number (54022706080).

Almost surely, 2^{1781368270836} 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 1781368270836, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2593089891840).

1781368270836 is an abundant number, since it is smaller than the sum of its proper divisors (3404811512844).

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

1781368270836 is a wasteful number, since it uses less digits than its factorization.

1781368270836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1494645 (or 1494643 counting only the distinct ones).

The product of its (nonzero) digits is 16257024, while the sum is 60.

The spelling of 1781368270836 in words is "one trillion, seven hundred eighty-one billion, three hundred sixty-eight million, two hundred seventy thousand, eight hundred thirty-six".