16664427 has 32 divisors (see below), whose sum is σ = 26832960. Its totient is φ = 10160640.

The previous prime is 16664411. The next prime is 16664447. The reversal of 16664427 is 72446661.

It is not a de Polignac number, because 16664427 - 2⁴ = 16664411 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 16664391 and 16664400.

It is not an unprimeable number, because it can be changed into a prime (16664447) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 69027 + ... + 69267.

It is an arithmetic number, because the mean of its divisors is an integer number (838530).

Almost surely, 2^16664427 is an apocalyptic number.

16664427 is a deficient number, since it is larger than the sum of its proper divisors (10168533).

16664427 is a wasteful number, since it uses less digits than its factorization.

16664427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 460 (or 454 counting only the distinct ones).

The product of its digits is 48384, while the sum is 36.

The square root of 16664427 is about 4082.2085933965. The cubic root of 16664427 is about 255.4250351007.

The spelling of 16664427 in words is "sixteen million, six hundred sixty-four thousand, four hundred twenty-seven".