16684428 has 12 divisors (see below), whose sum is σ = 38930360. Its totient is φ = 5561472.

The previous prime is 16684331. The next prime is 16684471. The reversal of 16684428 is 82448661.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-3 number, since 3×16684428³ (a number of 23 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 695173 + ... + 695196.

Almost surely, 2^16684428 is an apocalyptic number.

It is an amenable number.

16684428 is an abundant number, since it is smaller than the sum of its proper divisors (22245932).

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

16684428 is a wasteful number, since it uses less digits than its factorization.

16684428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1390376 (or 1390374 counting only the distinct ones).

The product of its digits is 73728, while the sum is 39.

The square root of 16684428 is about 4084.6576355920. The cubic root of 16684428 is about 255.5271830995.

The spelling of 16684428 in words is "sixteen million, six hundred eighty-four thousand, four hundred twenty-eight".