1781881336 has 16 divisors (see below), whose sum is σ = 3456235800. Its totient is φ = 860218464.

The previous prime is 1781881331. The next prime is 1781881337. The reversal of 1781881336 is 6331881871.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1781881331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3840030 + ... + 3840493.

Almost surely, 2^1781881336 is an apocalyptic number.

It is an amenable number.

1781881336 is a deficient number, since it is larger than the sum of its proper divisors (1674354464).

1781881336 is a wasteful number, since it uses less digits than its factorization.

1781881336 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7680558 (or 7680554 counting only the distinct ones).

The product of its digits is 193536, while the sum is 46.

The square root of 1781881336 is about 42212.3363011336. The cubic root of 1781881336 is about 1212.3450948314.

The spelling of 1781881336 in words is "one billion, seven hundred eighty-one million, eight hundred eighty-one thousand, three hundred thirty-six".