16781056 has 18 divisors (see below), whose sum is σ = 33497072. Its totient is φ = 8390400.

The previous prime is 16781033. The next prime is 16781059. The reversal of 16781056 is 65018761.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16781059) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32520 + ... + 33031.

Almost surely, 2^16781056 is an apocalyptic number.

16781056 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

16781056 is a deficient number, since it is larger than the sum of its proper divisors (16716016).

16781056 is an frugal number, since it uses more digits than its factorization.

16781056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65567 (or 65553 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 34.

The square root of 16781056 is about 4096.4687231810. The cubic root of 16781056 is about 256.0195297601.

The spelling of 16781056 in words is "sixteen million, seven hundred eighty-one thousand, fifty-six".