16781316 has 24 divisors (see below), whose sum is σ = 39278400. Its totient is φ = 5576352.

The previous prime is 16781299. The next prime is 16781327. The reversal of 16781316 is 61318761.

It is a super-2 number, since 2×16781316² = 563225133383712, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (3) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2185 + ... + 6191.

It is an arithmetic number, because the mean of its divisors is an integer number (1636600).

Almost surely, 2^16781316 is an apocalyptic number.

It is an amenable number.

16781316 is an abundant number, since it is smaller than the sum of its proper divisors (22497084).

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

16781316 is a wasteful number, since it uses less digits than its factorization.

16781316 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4363 (or 4361 counting only the distinct ones).

The product of its digits is 6048, while the sum is 33.

The square root of 16781316 is about 4096.5004577078. The cubic root of 16781316 is about 256.0208519799.

The spelling of 16781316 in words is "sixteen million, seven hundred eighty-one thousand, three hundred sixteen".