1781702228340 has 48 divisors (see below), whose sum is σ = 5543073600960. Its totient is φ = 475120594080.

The previous prime is 1781702228297. The next prime is 1781702228347. The reversal of 1781702228340 is 438222071871.

1781702228340 is a `hidden beast` number, since 1 + 7 + 81 + 7 + 0 + 2 + 228 + 340 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1781702228347) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1649723746 + ... + 1649724825.

It is an arithmetic number, because the mean of its divisors is an integer number (115480700020).

Almost surely, 2^{1781702228340} is an apocalyptic number.

1781702228340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1781702228340 is an abundant number, since it is smaller than the sum of its proper divisors (3761371372620).

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

1781702228340 is a wasteful number, since it uses less digits than its factorization.

1781702228340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3299448589 (or 3299448581 counting only the distinct ones).

The product of its (nonzero) digits is 301056, while the sum is 45.

The spelling of 1781702228340 in words is "one trillion, seven hundred eighty-one billion, seven hundred two million, two hundred twenty-eight thousand, three hundred forty".