16678912 has 32 divisors (see below), whose sum is σ = 33422850. Its totient is φ = 8323072.

The previous prime is 16678901. The next prime is 16678919. The reversal of 16678912 is 21987661.

It can be written as a sum of positive squares in only one way, i.e., 11943936 + 4734976 = 3456^2 + 2176^2 .

It is a tau number, because it is divible by the number of its divisors (32).

It is a super-2 number, since 2×16678912² = 556372211007488, which contains 22 as substring.

It is a nialpdrome in base 4, base 8 and base 16.

It is a zygodrome in base 4.

It is not an unprimeable number, because it can be changed into a prime (16678919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32514 + ... + 33022.

Almost surely, 2^16678912 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16678912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16711425).

16678912 is an abundant number, since it is smaller than the sum of its proper divisors (16743938).

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

16678912 is an frugal number, since it uses more digits than its factorization.

16678912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 539 (or 511 counting only the distinct ones).

The product of its digits is 36288, while the sum is 40.

The square root of 16678912 is about 4083.9823701872. The cubic root of 16678912 is about 255.4990202461.

The spelling of 16678912 in words is "sixteen million, six hundred seventy-eight thousand, nine hundred twelve".