1778744982 has 48 divisors (see below), whose sum is σ = 4170977280. Its totient is φ = 504200592.

The previous prime is 1778744971. The next prime is 1778745013. The reversal of 1778744982 is 2894478771.

It is a congruent number.

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, 13519 + ... + 61157.

It is an arithmetic number, because the mean of its divisors is an integer number (86895360).

Almost surely, 2^1778744982 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1778744982, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2085488640).

1778744982 is an abundant number, since it is smaller than the sum of its proper divisors (2392232298).

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

1778744982 is a wasteful number, since it uses less digits than its factorization.

1778744982 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47785 (or 47778 counting only the distinct ones).

The product of its digits is 6322176, while the sum is 57.

The square root of 1778744982 is about 42175.1702071254. The cubic root of 1778744982 is about 1211.6333795644.

The spelling of 1778744982 in words is "one billion, seven hundred seventy-eight million, seven hundred forty-four thousand, nine hundred eighty-two".