1778489856 has 240 divisors, whose sum is σ = 6032426400. Its totient is φ = 497295360.

The previous prime is 1778489827. The next prime is 1778489879. The reversal of 1778489856 is 6589848771.

1778489856 is a `hidden beast` number, since 1 + 7 + 78 + 489 + 85 + 6 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 1778489793 and 1778489802.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 657595 + ... + 660293.

It is an arithmetic number, because the mean of its divisors is an integer number (25135110).

Almost surely, 2^1778489856 is an apocalyptic number.

1778489856 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1778489856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3016213200).

1778489856 is an abundant number, since it is smaller than the sum of its proper divisors (4253936544).

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

1778489856 is a wasteful number, since it uses less digits than its factorization.

1778489856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2747 (or 2728 counting only the distinct ones).

The product of its digits is 27095040, while the sum is 63.

The square root of 1778489856 is about 42172.1454991325. The cubic root of 1778489856 is about 1211.5754484649.

The spelling of 1778489856 in words is "one billion, seven hundred seventy-eight million, four hundred eighty-nine thousand, eight hundred fifty-six".