16856680 has 16 divisors (see below), whose sum is σ = 37927620. Its totient is φ = 6742656.

The previous prime is 16856663. The next prime is 16856683. The reversal of 16856680 is 8665861.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 16826404 + 30276 = 4102^2 + 174^2 .

It is a Harshad number since it is a multiple of its sum of digits (40), and also a Moran number because the ratio is a prime number: 421417 = 16856680 / (1 + 6 + 8 + 5 + 6 + 6 + 8 + 0).

It is not an unprimeable number, because it can be changed into a prime (16856683) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 210669 + ... + 210748.

Almost surely, 2^16856680 is an apocalyptic number.

16856680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16856680 is an abundant number, since it is smaller than the sum of its proper divisors (21070940).

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

16856680 is a wasteful number, since it uses less digits than its factorization.

16856680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 421428 (or 421424 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 40.

The square root of 16856680 is about 4105.6887363754. The cubic root of 16856680 is about 256.4035383642.

The spelling of 16856680 in words is "sixteen million, eight hundred fifty-six thousand, six hundred eighty".