16681504 has 24 divisors (see below), whose sum is σ = 37533888. Its totient is φ = 7149120.

The previous prime is 16681499. The next prime is 16681507. The reversal of 16681504 is 40518661.

It is not an unprimeable number, because it can be changed into a prime (16681507) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37012 + ... + 37459.

It is an arithmetic number, because the mean of its divisors is an integer number (1563912).

Almost surely, 2^16681504 is an apocalyptic number.

16681504 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

16681504 is an abundant number, since it is smaller than the sum of its proper divisors (20852384).

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

16681504 is an equidigital number, since it uses as much as digits as its factorization.

16681504 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74488 (or 74480 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 31.

The square root of 16681504 is about 4084.2996951742. The cubic root of 16681504 is about 255.5122549055.

The spelling of 16681504 in words is "sixteen million, six hundred eighty-one thousand, five hundred four".